Robert De Niro's character, when discussing Sean Bean's character, mispronounces the town in England where the SAS HQ is. The actual English pronunciation is closer to "her'uh'f'uh'd", those "uh"s representing schwas and not Heer-ford as spoken by De Niro. However, there are many 'Herefords' in the USA (Texas, Arizona, California, and a few in New England) and many US Herefords are pronounced Sam's way, much as Americans often pronounce Edinburgh as Edin-Bro.
Vincent is supposed to be a mercenary or former intelligence agent with connections all around France to get whatever the team needs. Yet, during the initial briefing, he fails to recognize basic military terms.
The Audi in the Nice car chase alternates between an A8 and a S8 (should be S8 as ordered by Larry earlier). S8 has silver mirrors and a three-spoke steering wheel. In some shots, the Audi has body colored mirrors and a four-spoke steering wheel that comes with the regular A8.
Gregor is driving a Jeep Cherokee with an automatic transmission when he picks up the man to do the transaction for the case. When he stops at the playground, he clearly puts the car into park. When he presses on the gas, the car lurches forward, even though it is still in park, and he is able to shoot the man in the head.
In the early scene of the arms deal, when they are waiting in the car for the arms dealers to turn up, Robert De Niro (in the back seat) is initially unshaven, but then later in the scene he is clean-shaven.
In the car chase after the bald guy with the suitcase, when his car approaches a fish market inside Nice, you can see a guy with a water hose running to the right, to avoid being hit by a car. His hose is connected to some point on the left, however in the following shot there is no pipe across the road.
Just before the group goes out to collect the weapons from the buyers at the beginning of the film, the group are gearing up to go out, and Sam is talking to Deidre about the arms people. When Deidre burns the piece of paper and walks away her hair is obviously going down her back, but in the following shot there is now no hair on her back.
In the first chase while after the briefcase, the Audi sustains a fair amount of damage to the front of the car, including the headlamps being displaced. When the chase ends at the corner of the 3-way intersection, it shows an Audi with the front intact as it smashes into the front quarter of the Citroen. You can see clearly as the accident occurs that the driver-side headlamp is completely undamaged.
When the target vehicle is "400 m from the traffic light" just before Sam's team begins their assault, Gregor's computer displays its position as "LAT: 51 deg 52 MN 23 S, LG: 13 deg 5 MN 18 S". As the chase proceeds, at the point when "you should see them in 4 seconds", the computer again displays the position, and it's still "LAT: 51 deg 52 MN 23 S, LG: 13 deg 5 MN 18 S" even though the map has shifted.
Deirdre is driving an early-'90s BMW during the final car chase; the car has stock 17" M "turbine" wheels. The wheel that Vincent is shown to shoot out is a standard 5 series wheel, and is not seen on the BMW at any point during the chase.
During the chase scene, there is a Citroen XM series II (the citroen sign in the middle, on the front) and then there's a Citroen XM series I (the citroen sign on the driver's side, on the front). It changes back and forth a couple of times. There's also a difference at the bottom of the car; the series I carries the name Citroen XM on the left side, while the series II bears a Citroen sign on the left side and the XM sign on the right.
When Gregor tries to sell the case, he puts the Jeep into park (we hear the sounds of an automatic transmission, and in a brief shot of the pedals there's no clutch). But he jolts the car forward a minute later without shifting into drive.
When Spence draws the sniper ambush scenario on the whiteboard and gets stopped, the cup of coffee is set down on a small table. When Spence backs away into the cup, its handle has turned itself around.
In the middle of the film when Gregor is selling the suitcase onto the Russian guy in his jeep, you can see that when Gregor puts his foot on the accelerator the other guy jerks about and the last shot we see his head is down, yet the following shot he is looking at Gregor before the splatter of blood on the window.
When Gregor is in the chase scene at the old stadium, he runs/falls down some stone steps and loses his wire-rimmed glasses. In the next scene, he is wearing them once again, looking over his shoulder for Sam, who is chasing him.
On the freeway chase scene between the BMW and the Peugeot, when the BMW gets flipped over and slides and the Peugeot hits it, the BMW goes over the edge and Peugeot slides round almost facing backwards. In the following shot from the ground the Peugeot has changed direction.
While chasing Deidre the dividers between the lanes change. Right after the chase leaves the tunnel all the views of the road scene looking back at the cars show a road with a solid concrete divider separating oncoming traffic. But all the "driver's eye" views of the road show a post and guard-rail type divider.
When the group are discussing the plan for the ambush, the top line and words on the whiteboard changes, and the arrow changes from being pointed at the bottom of one of the photos to pointing at the top photo.
At the start of the Nice ambush for the silver case, the bad guys are shooting at Sam who is leaning against a grey car. He ducks behind it, but in the following wider shot Sam is still leaning against the grey car.
During the arms deal scene at the beginning, when Vincent and Spence go underneath the tunnel approaching the arms dealers boss, one of them shouts, "Stop!" He raises his right arm when shouting, but in the following close-up he has actually raised his left arm. Zoom in required.
At the beginning, when the group are discussing the plans for the ambush and the driver says, "I'm gonna need an Audi S8," Gregor looks up and stops writing, but in the following shot his head is down and he is still writing.
Just before the Nice chase scene when Deidre gets off the train, she walks to an elevator. If you look to the left of the screen you can see Seamus with a black hat or french beret on, but in the following shot, the hat has disappeared.
In the Nice chase scene, when the two cars come to construction work on the road, in the far shots the Audi S8 is quite close to the Peugeot, yet when the Peugeot swerves to avoid a crash with the construction lorry, if you slow it down you can see the Audi has completely disappeared.
The car Deirdre drives in the final Paris car chase is an early-90s BMW 5-series. It is badged as M5, and has the correct wheels for this model. However in the tunnel scene, the dashboard shown is from a non-M 5 series, as all M models have red needles on the speedo etc, and this car has white needles.
When Sam hands Larry the case he has an earpiece in his right ear. However when he notices the paint on his jacket and hand, the earpiece is missing. He then takes the case back and throws it and the earpiece is there again.
In the car chase at Nice, Sam gets into the back of the brown Mercedes, behind Vincent. The next scene has him the passenger seat beside Vincent. While not impossible, it would be a rather quick switch in a fast moving vehicle to accomplish this.
During one of the car chases, the first shots of the Audi S8's interior show Audi's late 1990s-early 2000s steering wheel (consisting of Audi's four-ring logo in silver and surrounded by a circle). In later shots of the same chase, the steering wheel is that of Audi's earlier 1990s design (Audi's four-rings which have been enlarged to fill more of the steering wheel, lacking both the surrounding circle and the silver finish to the rings).
Sam and Vincent are in the car, waiting for Gregor, Seamus and Deirdre to exit their safe house. Sam, in the near seat, has his side mirror angled so he can see straight behind the car. He makes mention to Vincent, who looks from the other side of the car. The mirror angle would mean Vincent could not see them from his position.
At the Roman coliseum at Arles, Vincent is surprised by the Russian, Sergi, who recognizes him from some past action. As Vincent replies 'Vienna' Sergi's gun arm is already straight but in the next scene it has changed position and is bent at the elbow.
As Witt is skating around the ice there is a shot of the crowd, completely packed. After that, there's a cut to Witt again, but now (only for a second) there is no one in the right side of the audience. The camera then pans left and for the rest of the shots the extras were obviously moved around to keep the appearance of a packed ice rink.
At 50 minutes in, we have the silver case and paint transfer which DeNiro sees as to why the case he had was fake. But when DeNiro first takes and hands off the case, he has no silver transfer on his jacket front, nor on his sleeve. There's also no silver paint transfer to Gregor, who'd been holding the case before DeNiro took it from him. Once the shot moves to the alleyway, then the silver is seen on DeNiro's coat.
At the end of the Paris car chase with the BMW M5 and the Peugeot, Jonathan Pryce fires a few shots at De Niro and Jean Reno in the pursuit car. One shot takes the left wing mirror clean off, and De Niro even jerks his head to the side in reaction to the shot. The mirror comes off in mid frame, and you can even see the adjustment wires dangling from the mirror base. In all subsequent scenes, the mirror is back on the car.
Near the beginning, when the group are talking over the ambush to steal the case, Sam walks to the table where Deidre is and Gregor follows. When Sam accidentally knocks the cup off the table, Gregor's hand changes position on the cup between when he catches it and the following shot.
In their initial hideout discussing the ambush, De Niro repeats several times to Sean Bean "Draw it again" then they have argument and De Niro apprehends Sean Bean. In the shot where De Niro pulls gun out of the back of Sean Bean's trousers, Sean Bean is definitely turned with his back to De Niro, where in the previous and following shot he is facing De Niro.
In the ambush under the bridge, the police car which can be seen across the river is a Peugeot 405, yet by the time it reaches the people at the bridge and chases the Audi it is a much smaller Peugeot 205.
At the start of the first chase scene in Nice, Jean Reno walks across the road to test the traffic lights device. There are concrete cones to the right of the screen, NOT by the grocery store, yet, on the overhead shot, when he is trying out the lights, three have appeared in front of him next to the grocery store.
At the end of the chase in Paris, when the BMW falls off the bridge into the building site, Gregor leaves the car through the back door window. During the chase he sat in the front of the car. He had also fastened his seatbelts, which would have prevented him from falling into the back of the car while it was crashing.
Two Citroen XM's are used in the car chase in Nice: one old model (lateral Citroen logo) and one new (Citroen logo in the middle of the frontal part of the car). So throughout the chase, it is easy to see that they switch from one car to the other.
When Gregor is standing in the pub looking for the two Russians near the arena, he looks through a camera to spot them. When we look through his lens, we first see them from below the viewpoint & far away. Then we see them again, through the lens above the viewpoint and closer, as if Gregor has changed positions and is now below the Russians. Yet we see that he has not changed locations in the following shot, he is still in the pub.
When Vincent is preparing to help Sam attend to his bullet wound, the outside of Sam's Kevlar vest surrounding the bullet hole is soaked with blood. When Vincent cuts the vest off, Sam's undershirt has very little blood on it.
During the second car chase when Larry forces the target car into the outdoor café, several diners and a waiter are knocked down by the cars and lay unmoving on the sidewalk. However, seconds later, after the bodyguard and man with the briefcase are killed, not a single diner is seen.
When Sam aims the LAW rocket launcher at the chase car on the mountain road, there is a car clearly visible behind Sam's Mercedes. A moment later when Sam fires the rocket, the car is nowhere in sight despite the scene being on a long straightaway.
When the shooting starts at the botched weapons exchange, a man on the left side of the arms dealer's car reacts to being shot at the same time Vincent is shooting the fat man. A moment later, as Vincent reloads, Sam pops out and shoots the same man on the left side of the car, who is now standing, ready to shoot.
In Arles, when Sam, Vincent and Diedre are in the car looking for Gregor, Sam is told Gregor is "at the coliseum". In the next scene Gregor is still in the pub. Since his (presumably) CIA contacts are triangulating Gregor's cellphone and not monitoring his conversation, this is a simple editing error.
In the first chase while after the briefcase, the Audi sustains a fair amount of damage to the front of the car, including the headlamps being displaced. When the chase ends at the corner of the 3-way intersection, it shows an Audi with the front intact as it smashes into the front quarter of the Renault. You can see clearly as the accident occurs that the driver-side headlamp is completely undamaged.
Just before they head out to make the deal with the arms dealers, De Niro and Skarsgård are talking at a table, if you look on the table there is a flask and a cup. In the first shot, the cup is on the left of the flask, but on the overhead shot it's on the right of the flask, then it's back on the left.
When Seamus, Deidre and Gregor are in an apartment just after Seamus comes out of the bathroom after beating up Gregor, he is holding a glass in his left hand after he pours the drink, then in the following shot the glass is now in his right hand.
When the group is going over the Nice ambush, Sam gets up, closes the door and Deidre walks in from the kitchen and sits down. At the door, Larry is taking a sip of his drink, but in the following shot the cup is on its saucer and he is holding it with both hands.
Third and final car chase sequence. Right after the truck tips on its side and crushes several vehicles, we see a shot of it from the left side and crew and camera are clearly visible behind the guardrail on the far left.
Shortly after the AudiS8 chases the CitroenXM through the fish market, both cars then go into a narrow street. There is a rear shot of the Audi going into the street where you can see camera equipment on the roof of the car. In the next outside shot of the car it has gone.
When Vincent and Sam are running through the ice rink's changing rooms to get the case off Gregor, the camera passes a mirror. If you pay attention, you can quite clearly see the boom operator wearing a blue and white checked shirt in it.
After they find the case, De Niro throws the case under the car before it blows up. Then the French guy drives a car up to pick him up and get away. Look at the window when the door is open, you can clearly see the reflection of the boom mic.
(at around 1h 29 mins) During the final car chase, right after the police car flips over in the tunnel, a camera man and crane can be briefly seen on the left hand side behind behind a nook in the tunnel wall.
Jean-Pierre claims that "All 47 of them committed Seppuku," but in fact only 46 did. The 47th Ronin, Terasaka Kichiemon, had a different mission. He was later pardoned. When he died at 87, he was buried along with the other 46.
When Gregor shoots the guy in the car after nearly killing the little girl, blood sprays over the window, but there's no bullet hole. If the bullet exited his head, hence spraying blood, it should have gone through the window too.
Supposedly the holders of the mystery briefcase are holed up in Nice; but when De Niro and McElhone go to check out the bad guys security arrangements at their hotel, the hotel is in Cannes (believe me) and the Michelin Green Guide that De Niro is carrying is opened to a map of Cannes.
In the scene where the bullet is removed from Robert DeNiro, he notes that it was sprayed with Teflon and claims that this is why it has penetrated the "bulletproof" vest. This is incorrect. Merely spraying a regular bullet with Teflon will not make it pass through body armor. Armor piercing rounds must be constructed of extra hard materials that will not deform, and usually have pointed tips to spread the fibers of the woven material of the armor. The myth of Teflon bullets came from an early round by the KTW company which used Teflon to protect the gun barrel from these extra hard materials.
In the story a bullet goes through De Niro's bullet proof vest. He states it is because the bullet was sprayed with Teflon. Teflon will not cause a bullet to defeat a bulletproof vest. Teflon is used to protect and lube the barrel of a gun when firing steel core ammo. Steel core ammo may defeat a bullet proof vest but without lube it will wear out the barrel.
During the car chase in the tunnel, the car's headlights blink off and on to warn the oncoming cars, but the hands of the driver never leave the steering wheel. The headlights appear to blink independently of each other as well.
In the scene where Sam & Deidre are sitting in the Audi spying on the villa, you can see that the car steering wheel is a 3 spoked sports type which is right for that model. Later just before Larry smashes it into the Citroen outside the cafe, there is a close up of him as he comes out of a side street, you can see that the steering wheel is changed to that of 4 spoke design used on the normal A8 and not on the S8.
During the car chase in Paris the hands on the steering wheel of the BMW during inside shots appear to be male hands (obviously the stunt driver).
This especially obvious in a shot shortly after they have left the tunnel.
During the car chase, when the two cars swerve to avoid construction and drive along the dirt road, the camera switches between low tight shots of the fronts of the cars and you can see a cloud of dust from the camera truck in front of the lead vehicle.