Continuity mistake: When Walter is in the music store, a man puts on his glasses and walks past him, then in the next close-up that man is at the counter, puts on his glasses and walks past again. Other people around Walter, in both shots, differ in their actions too. (01:11:20)
Continuity mistake: When Keaton is talking to the plumber outside her house about the price of replacing her pipes, keep your eye on the van door. It is open, then closed and then open again.
Continuity mistake: In the scene where Loretta goes to the brother's apartment, cooks him a rare steak & they are sitting at the table talking, the label on the bottle of J&B changes direction from shot to shot without being touched.
Continuity mistake: After Dean discovers Joanna on the couch, her face covered in calamine lotion, he picks her up and carries her into the bedroom. As he sets her on the bed the viewer can see her face is free from any "spots" and/or lotion.
Continuity mistake: The way that Derek's scarf is tied, and the position of it, and the way it hangs etc., changes between various shots throughout the movie. One good example is when he pulls the gun out of the stupid alien's body. (00:18:55)
Continuity mistake: Has a scene set during the Festival of Britain (1951). Oldman and Molina are shown at night on the South Bank of the Thames, ostensibly having just attended the Festival. In the background is a very clear view of New Zealand House, which wasn't built until the early 1960s, some ten years after the scene was supposed to take place.
Continuity mistake: During the sketch where the old man is zapped into the TV, when his wife changes the channel Ronald Reagan is stepping out of a plane that is light blue, but when the old man steps out of the plane it is now a dark blue with a silver strip.
Continuity mistake: When the microwave explodes, the bucket of chicken disappears right after the explosion. (00:48:50)
Continuity mistake: When Chris, Brad and Sarah are watching TV in the living room you can hear a scene from the movie Halloween but there is something totally different on the TV. Also, as Chris starts to leave later on, there are several shots of the TV and Halloween is now on screen but the scene being shown is the same one that was heard earlier.
Continuity mistake: When the "ghost" is first seen, it is mostly obscured by a curtain; only its right shoulder is visible. In the next shot, however, it is right in the middle of the window, and nearly the entire cutout is exposed.
Continuity mistake: At the end of the movie, when the kids are taking the test, the girl that is pregnant breaks her pencil in half because she is having contractions, but in the next consecutive shot (no time has passed) her pencil is intact.
Continuity mistake: In the scene on the roof when the local hoodlum is attempting to take on the flying saucers you see the scene from two points of view. There are four people watching the local hoodlum getting fried. From the front, from left to right you see an old guy; a tall black guy; a women in pink and then a young guy with lots of hair. When seeing the scene from behind these watchers, you only see the old guy and the guy with the all the hair. Each time the angle changes the tall black guy and the women in pink are there.
Continuity mistake: A display rack which Sam knocks to the floor keeps changing position. (00:17:45)
Continuity mistake: When their car blows up, look in the background and you can see Friday practically kneeling on the ground, and Streebeck falls over completely. Within two seconds (and a couple of cuts) they're both standing up, fully alert with their guns out - Friday might just have managed it at a push, but Streebeck went from face down on the pavement to upright far too quickly.
Continuity mistake: At the end of the movie the daughter hands Harry a stem of flowers. The flowers have small daisy like heads. However, when the shot changes to show Harry holding the stem, it is very different. There are less flowers on the stem and the petals are larger.
Continuity mistake: At the end of the movie, the two balloons are in the air. As one of them goes down to land, we see a shot with balloons on the ground. In the next shot, one of them is still up and flying.
Continuity mistake: When Ronald is in the store talking to Cindy about renting her and the salesman is looking at them through the telescope, Ronald has the money in his hand fanned out. When the camera cuts to the store, the money is not fanned out in his hand anymore.
Continuity mistake: In the car, after the laundromat, Larry and Owen are talking, and Larry's laundry is in the passenger seat in a basket that is not seen until a minute later, when it is suddenly very visible.
Continuity mistake: In the part where the nerds are in jail, there is a close-up scene of a mean character that throws down his playing cards before he approaches them, but then when the next (wider) angle is shown, you can see the same man throw down his cards again. (00:57:55)
Continuity mistake: When Horace is confronted by the Gillman and has picked up the shotgun, he looks inside and sees E.J. and another kid hiding behind the counter. Horace begs them to let him in. E.J. and the other kid shake their heads no and lower themselves behind the counter. A few seconds later, a distant shot shows the two shaking their heads and lowering themselves behind the counter again.