Continuity: When The Master is waving Torgo's stick at him, he is waving it side to side slowly when seen from Torgo's point of view. When we see it from behind, he is jerking it around quickly.
Crew or equipment visible: The first time the cop tells the teens to move on, the slate (or clapper) is briefly visible on the right hand side of the screen.
Continuity: When Michael and his family are attacked by the snake, the stock footage of the snake was obviously filmed in broad daylight, even though the characters are surrounded by the dead of night.
Revealing mistakes: At the beginning, when the family pulls over, and after Mike says his line, he mouths the word "Cut!"
Continuity: Although they are supposedly in an abandoned area, a car is visible driving in the background when the family is first talking to Torgo.
Revealing mistakes: As the Master goes to break up his wives' fight, his rolled-up jeans can be seen as he lifts his cloak.
Revealing mistakes: Throughout the movie, the zipper on the master's back is clearly visible.
Continuity: As the parents are talking to Debby after Peppy-the-poodle was killed, the gun and flashlight disappear from Mike's hands.
Continuity: During the search for Debbie; Margaret's scarf on her head disappears and reappears several times.
Crew or equipment visible: Crew member visible standing behind a bush as the wives fan out to look for Mike and Margaret near the end (uncut version only, not visible in the MST3K edit).
Audio/visual unsynchronized: When the cop slams his car door to have a talk with the teens in the car, the sound effect is delayed.
Errors made by characters (possibly deliberate errors by the filmmakers): When the cop pulls over the family for the busted tail light, he begins writing the ticket without asking to see a license.
Revealing mistakes: The female teenager in the car misses her cue, looks directly into the camera, then delivers her line.
Revealing mistakes: When Michael shoots the Master at the end of the movie, the Master disappears from the shot, showing Michael clearly firing on an empty hallway.
Revealing mistakes: Moths are attracted to the camera in night scenes. A big one flies by in the right side of the frame when Mike runs out to find Peppy, the family's dog.