Continuity: Claude and Herbie switch places with one another in the Ferris wheel when attacked by Wild Bill's P40.
Continuity: When Crumm and Kazlminsky are first in the Ferris wheel, Crumm is on the left and Kazlminsky on the right. Later in the movie, though, they have switched places.
Revealing mistakes: After Kelso crashes his plane, he opens his parachute and the wire pulling the chute away from him is visible.
Errors in geography: The reconstruction of Hollywood Boulevard has some of the buildings at the wrong locations.
Continuity: After Wally rescues Betty from the clutches of Sgt. Sitarski, she gets up from the street and runs away (her skirt is very dirty), when we see her walking away from the incident in tears, her skirt is completely clean. Then Wally scoops her up onto the tank, her skirt is dirty again.
Anachronisms: During the general's speech at the airport a number of WW2 era airplanes have been staged as a contemporary backdrop. However, visible in the background are some new airliners and what seems to be a B-52 parked at this modern-day airport.
Continuity: When Kelso crashes the plane, he knocks over the traffic signal pole. After he gets out of the plane, the pole is intact and upright again.
Continuity: Betty's costume undergoes numerous changes from dirty to clean and clean to dirty, as well as completeness. When she and Wally first get into the dance, Wally pulls her blue jacket off her and wraps it around Cpl.Sitarsky's head. For the rest of the movie, she has the jacket back on. While Betty and Sitarsky are rolling around underneath the truck, her skirt is very dirty. The next time you see her, it still dirty, but not as dirty as it was in the previous scene. When Betty is shown at her house the morning after the attack by the Japanese sub, her entire outfit is completely clean.
Continuity: When Cpl. Sitarsky and Maxine get out of the car in the final scene of the film, they are handcuffed together. The next time they are shown, there are no handcuffs.
Continuity: When the tank crashes through the front door of the house, it crashes through the upper middle of the door. When Aykroyd looks through the door a shot later, the upper left of the door is busted, with the upper middle of the door still intact.
Continuity: When Captain Birkhead and Donna get out of the car, Donna is handcuffed to an MP, but like Maxine and Sitaski, their handcuffs disappear a few minutes later when the house collapses.
Audio/visual unsynchronized: When Donna says "You get me up in that plane, then we'll talk about forward thrust.", the reflection of her mouth movements in her hand held make up mirror don't match her voice.
Continuity: When Loomis (Tim Matheson) crashes the plane in the La Brea Tar Pits, he is only wearing his beige uniform shirt while Donna (Nancy Allen) is only wearing her short sleeved gray shirt. When they open the door and scream at the dinosaur statue, Loomis is wearing his dark brown uniform coat and Donna is wearing her long sleeve gray coat.
Continuity: When Capt. "Wild Bill" Kelso shoots the radio inside the gas station, the slide of his pistol locks back indicating that the gun is empty. Right after that he runs after his runaway plane and fires more shots into the air.
Continuity: On the Ferris wheel, the position of the blanket between the two men changes just before the ventriloquist dummy appears.
Miscellaneous: When Hollis P. Wood is being attacked by the 'pine trees', he loses his hat. In the next seen, he falls and his hat comes off again.
Revealing mistakes: When Wally is dancing on the table the real dancer's feet are seen jumping up as Wally is jumping down.
Revealing mistakes: When Angelo pushes the anti-aircraft gun back towards the house with his car; the clutch is easily visible, but he never uses it to put the car into gear.
Continuity: When Kelso fires his machine guns while on the ground, the canopy on his plane is open, then closed, then we see him close it again.
Anachronisms: When Hollis Wood refuses to tell the Japanese submarine officer where Hollywood is, he makes a reference to the Japanese probably wanting to bomb John Wayne's house. In December 1941, John Wayne had yet to make any of the war movies that would make his name synonymous with American patriotism.