Continuity: When Jack is having a seizure at his job he stuff some aspirin in his mouth. When the manager says "He is spaced out." it cuts to the girl saying "I'll handle this.". At that point Jack has got two aspirin hanging out of his mouth. It cuts and the aspirins are gone.

Visible crew/equipment: After The Cowboy has put out his cigar in his hand he flips through a magazine. At two points you can see the protective item he's got in his hand to avoid getting burned by the cigar.

Continuity: We see Jack looking in a mirror in order to show himself to Tuck, but when he turns away, the picture on Tuck's monitor is still focused on the mirror.

Continuity: In the beginning, after Dennis Quaid has been beaten up, the pins on his jacket are pinned, then hanging askew, then pinned again.

Revealing: When Jack is hanging out of the truck you can see him standing on the hood of the car which Lydia is driving. At some points we get camera view from the back seat of the car. In some angles the mirror inside the car disappear. This is to prevent us from seeing the camera.

Revealing: When Martin Short is escaping the lab in Dennis Quaid's car, Dennis says that it is a 5-speed manual transmission. Immediately after this you can hear the car very smoothly shift up gears but Martin's hands haven't left the steering wheel.

Continuity: Inside the truck when Jack is freezing his head is shaking. But from Tuck's view, inside Jack, he is not shaking at all.

Continuity: In a scene right before Jack jumps into the car from the truck we can see Lydia grab the back of his ankle. When it cuts the way she holds his ankle changes.

Continuity: Just after the scene where Jack Putter gets tazed by Lydia Maxwell in the restaurant, Mr. Igoe initially hauls the unconscious Putter over his left shoulder. In the following shot you'll notice that when he exits through the back door, he's carrying Putter over the right shoulder. This mistake was pointed out by the director (Joe Dante) himself on the commentary track of the DVD version.