Revealing mistake: When Kirk and Kruge are fighting, a piece of the cliff breaks away and wiggles down the side of the cliff rather than falling like a rock. (01:22:55)
Revealing mistake: When Col. Tanner is on top of the Russian tank, he is firing his pistol into it. After a few shots, you can see that the slide on his gun locks back, showing that the gun is empty. Tanner does not reload, but is none the less able to keep shooting afterwards. (01:11:25)
Revealing mistake: When the Russian pod is launched, a wide shot shows the Monolith at top/right with Jupiter in the background and both the Leonov and Discovery at bottom/right with the pod nearby. Just before this shot ends, all three spacecraft vanish, leaving only Jupiter and the Monolith for a very short but obvious moment. (01:04:35)
Revealing mistake: When the sheriff is going to whip Sarah, he tells her to take down her drawers. Bad editing, you see her hand reach back and make the motion as if she is pulling down her panties but it is visible they are still up.
Revealing mistake: In the opening scene where the alien car is pulled to the side of the road by the cop you can see two identical sets of tire tracks in the dust in the same place - a sign that this scene was filmed more than once in the same location and the filmmakers didn't wipe away the tracks. As the car pulls out you can see another set of identical tire tracks further up the road as well.
Revealing mistake: When Charlie sets the mens clothes on fire, burning gel is clearly visible on their clothes. (00:38:30)
Revealing mistake: When Chocolate Mousse throws the anchor with the rope attached into the air, if you watch the ground when they run away, you can see that there's suddenly a lot more rope there, revealing that it was filmed in two takes and the anchor wasn't really thrown directly above their heads. (01:11:20)
Revealing mistake: Going to his father's old place, David and Allison turn right on the corner, pass some stores and then turn left to drive into the lot of the Texaco station. The reflection shown in the stores' windows across the street is not at all what is supposedly across from those stores. Also, when they start to pull away from the station a set of studio lights are reflected in the side back window of the car. (01:02:40)
Revealing mistake: When Roger is in the bathroom at the urinal, he can see Edwina's reflection in the mirror (as she is, supposedly, inhabiting his body). However, when Roger lets out a particularly big exhale, Edwina's bangs blow slightly upwards, showing that the "mirror" effect is achieved by simply having her stand behind a wall right in front of him. (00:29:45)
Revealing mistake: When the village where Pran is hiding as a servant is bombed, you see a lot of stuntmen performing elegant jumps as if they were doing gymnastics, some long after the impact of the bomb would have hit them. (01:56:50)
Revealing mistake: As Vicky and Burt are driving down a dirty lane, through a row of corn, you can see fresh tire tracks in the mud from a previous take. (00:34:35)
Revealing mistake: In the scene when Turbo is sweeping in front of the grocery store, he begins dancing with a broom and you can see the wires that are holding the broom up, making it seem like the broom is floating.
Revealing mistake: When the Hotel manager walks in the recently vacated room, we see the piano collapse. If you look closely, you can tell that the front two legs were just pulled back under the piano causing it to collapse.
Revealing mistake: When a man is shot in the head, the bullet hits his hat, and it's very obvious there's no real bullet wound, his hat just opens and reveals a red hat he's wearing.
Revealing mistake: When Bob Cratchit takes Tiny Tim by the town square to watch the boys play, you see many boys "sliding" on the ice. In the close-ups of the boys you can see the "ice" ripple beneath their feet, revealing it to be some sort of plastic.
Revealing mistake: Almost every time a floating robot explosive that is chasing the police cars is seen, you can see a wire that is pulling them.
Revealing mistake: When Ariel is playing chicken with the oncoming truck, as she is standing on both cars, notice that her hair is dark brown to black in colour, then it's blonde again. The hair colour changes a few times. It's obviously a stunt woman.
Revealing mistake: When Tom tries to fix the dam during the rainstorm his face is suddenly dry in the two shots before the track of his bulldozer snaps. (00:06:25)
Revealing mistake: Before the birds attack the helicopter, the close exterior shots reveal that the helicopter is a prop in a set that's not moving a single inch, as opposed to the wide shots of a real flying helicopter.
Revealing mistake: During the final earthquake, the camera shakes vigorously but not a single blade of grass or leaf moves in the slightest. (01:27:00)