Continuity mistake: The first car he jacks is a white 4 door Oldsmobile Cutlass salon, and a 2 door Olds Cutlass Supreme in the next. (00:09:30)
Continuity mistake: In the opening scene, the motorcycle patrolman asks the driver for the keys to check the trunk. We see him get vaporized and the keys dangling from the trunk, then without getting out of the car, the driver drives away with the keys no longer dangling.
Visible crew/equipment: Just before Otto and Bud enter the liquor store, when the gang (Archie, Duke and Debbi) are leaving having robbed the place, a boom microphone can be seen reflected in the store window's glass near the top (right side of screen). Additionally, when Otto and Bud enter the store, Bud says "awful quiet in here" and the boom mic can be seen again much more clearly in the glass window next to Bud's head. (00:23:45)
Continuity mistake: In the opening scene, after the Malibu is pulled over and the cop approaches from the rear, the person in the driver seat is very short and is not Fox Harris, who is much taller as seen driving throughout the movie.
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.
Visible crew/equipment: There is a scene in this movie where Emilio Estevez and his partner are sitting in a car outside a shop. The camera tracks in on them. The problem is the crew havent bothered to hide the camera track running from the bottom of the frame up under the car. There is a badly placed black mat that covers a bit of it but this just draws your attention to it.
Revealing mistake: Throughout the film, Agent Rogersz is supposed to have a metal hand however there are many times when you can tell it is just a steel-coloured glove as her fingers move like real human fingers when they should be stiff. The films producers have stated that they could not find a convincing prop in time for shooting.
Continuity mistake: When Otto is talking to the old lady in her home he finishes the conversation and then puts the tea cup to his lips for a drink. Then cut to a new angle (as the woman's young family members enter her home) and suddenly Otto is holding the tea cup in his lap. (00:42:40)