Character mistake: It's said in the movie a vice presidential candidate never gave a concession speech. Geraldine Ferraro did this in 1984.
Continuity mistake: In the intro, the mother is playing with her kid; notice that when she grabs the gladiator puppet she is holding it with the index finger above the shoulder in the wider angle, below in the frontal close-up. (00:01:00)
Continuity mistake: The position of Beth's truck facing her motel room (106 or 706?) changes during the time she is talking to Holly. Sometimes the truck is closer to the room next to hers (105 or 705) and to where Beth is standing. Also, the truck's front tires are different distances from the curb. (00:48:25)
Continuity mistake: The objects on the desk at Lax's interview with Herman change several times. Sometimes, the tripod is closer to the center of the desk, about a foot away from the file folder, but other times it is closer to where Lax is sitting and one leg is almost touching the folder. The angle of the file folder and distance to the edge of the desk also varies. The Styrofoam cup switches from one side of the desk to the other. (00:17:07 - 00:18:20)
Factual error: The Life One spacecraft is hit by a micrometeoroid. Sparks are to fly, among other effects. The sparks are bifurcated, meaning they were produced by using a grinder, not by a micrometeoroid collision.
Revealing mistake: In the opening scene, Johnny and Hickey sit in the front seat of a car. Views out the side windows blur, there is a gray background behind Johnny instead of the rear window, and when Hickey holds the cross toward the windshield, the "outside" is all grayish-white. At one point, there is light on Johnny's right forehead, cutting diagonally downward (too linear to be the sun), and another time, there is light behind Hickey on his headrest. (00:00:31 - 00:03:30)
Visible crew/equipment: When Fred is carried on to the Camp Iwannapeepee bus and the doors close, a camera tripod and crew member are reflected in the door windows. (00:08:57)
Factual error: The chief of police holds the rank of captain. But the Ontario Provincial Police, to which she belongs, uses the standard Commonwealth police ranks of inspector and superintendent instead of army ranks.
Revealing mistake: Britney's obviously on her knees when she shrinks back down to regular size.