Continuity: At the start of the movie, when the camera pans across the road, the red Renault Megane that is subsequently used by Shaun and his friends is missing the Renault badge. It appears and disappears again several times during the movie.
Continuity: The second time Shaun goes to the shop he slips in a puddle, when he walks away there is clearly no puddle.
Continuity: The red mark from the leaky pen in Shaun's pocket changes size and shape several times even before he gets covered in Zombie blood.
Errors made by characters (possibly deliberate errors by the filmmakers): Towards the end of the movie, there's some TV news footage and the caption reads, "Rememering Z-Day" - "Remembering" is misspelled. This is fixed on the DVD.
Crew or equipment visible: When the gang attacks the pub landlord, you can see the dolly tracks on the floor.
Crew or equipment visible: Each time Shaun opens the fridge door in the shop, the camera is reflected in the door.
Revealing mistakes: In the opening montage, you see Mary the checkout girl, working at the supermarket. On her name-tag it says "Landis Supermarket", yet on the checkout it clearly reads "Asda Supermarket".
Crew or equipment visible: When they first start beating the pub owner with pool cues, the actor/stuntman is clearly wearing padding under the back of his shirt.
Continuity: After Mary gets up, Ed winds the camera to take a picture, but he already wound it right after taking a picture of Shaun and Mary together.
Continuity: When the characters are in the car, the wound on Bill Nighy's shoulder changes and then changes back.
Continuity: After Mary gets impaled on the pole in the yard, she gets up twice.
Continuity: When Mary falls onto the pole in the back garden, she is at an angle where her feet are facing Shaun and Ed. In the next shot, her body has rotated so her feet are facing the fence to Shaun's right.
Continuity: In the basement of the pub, Shaun puts his hand behind Liz. In the next shot, his hand isn't there, and then in the shot after, his hand is back.
Continuity: In the Pub basement, Shaun puts a cigarette in Ed's mouth and lights it for him. In the next cut, the smoke is not lit, cut back again, and it is lit.
Continuity: When Dianne throws Shaun the tennis pole, she throws it so he should catch it with the tennis ball to his left-hand side, but in the next shot he catches it so that the tennis ball is on his right-hand side.
Continuity: During the Queen fight, as Shaun falls and gets back up, his pool cue swaps hands twice, but only one is deliberate.
Continuity: When Ed lights the Molotov cocktail, it disappears when the zombies drag him.
Errors made by characters (possibly deliberate errors by the filmmakers): When Shaun and Ed are frisbeeing vinyl at their two zombierific backyard invaders, Shaun claims that a copy of New Order's "Blue Monday" is an original pressing. The first pressing of this 12" single in the UK was in a die-cut sleeve with a black insert, so the one in the film is obviously a later release.
Continuity: In the pub, after Shaun has shot his mother, he drops the gun to his side, with David standing some way behind him. After he punches David, David flies backwards still further, and when he lands, the gun is right beside him.
Crew or equipment visible: When Shaun is climbing through Liz's window you can see the top part of a scaffolding pole from the platform he was standing on.
Continuity: The "shaved" patch on the back of Ed's head changes size throughout the movie. In some shots, it is very small, but in others, it is quite prominent.
Continuity: When Shaun and Ed are throwing objects at Mary and the Fat Man in the garden, one of the first objects (and another later) goes through the back window and the interior curtains are seen to fly up in the air. When they run out of objects all of the windows are still intact.
Boom mic visible: When Shaun is walking to the shop (for the second time - when the zombies are rampant), the boom is reflected in the blue car on the side of the street.
Continuity: When Shaun is walking to the shop (for the first time - when the zombies are not yet rampant), a man is cleaning the windscreen of his blue Vauxhall Cavalier, the windscreen is a tinted one (solar green with a blue shade). When Shaun is walking to the shop (for the second time - when the zombies are rampant), the smashed windscreen of the same Cavalier is a clear one without any tint or shade. The first shot was probably taken after the second one, as the tinted windscreen appears to have been replaced, as the rest of the Cavalier's glass is not solar tinted, too.
Continuity: When Shaun and Ed are playing on the PlayStation, when the camera cuts to the screen the level they are playing on changes.
Continuity: When Shaun goes to Liz's flat to patch things up with her after not booking the restaurant, he says he doesn't need cigarettes, and throws his pack of Embassy into the bin. Later, at the end of the film, Liz offers Shaun a cigarette from the same pack she took from the bin because she was desperate, yet the pack is now Marlboro Lights.
Continuity: During the living room fight scene with the groom zombie, Ed picks up an ashtray to use as a weapon. You can clearly see that the ashtray isn't in his open hand as he swings his arm, and luckily reappears just in time to crash into the zombie's head (about 30 minutes into the film).
Revealing mistakes: After Shaun picks up Liz at her home, the Jaguar the group is using to get to the pub has a rear-view mirror in some scenes and it is missing in others moments later.
Revealing mistakes: When Liz uses the fire extinguisher she is holding the horn with her left hand. This part of a CO2 extinguisher becomes very cold when fired - enough to burn skin. She should not have been able to do this without suffering injury.
Crew or equipment visible: When the 'Groom Zombie' enters Shaun, Ed and Pete's home you can see positioning markers on the floor in Shaun and Ed's reaction shot. Look to the lower right of the screen and you'll see at least two markers in blue tape on the floor. These are for continuity and should not be visible in the final cut.
Factual errors: The film is clearly contemporary, when public ownership of guns is illegal in the UK. The Winchester pub could not have a gun, working or otherwise, on public view.