Continuity mistake: When poor George is about to be sucked down the drain by the blob, he is looking at his hand. When the blob attacks him, he's holding on to the sink with both hands.
Continuity mistake: When Peaches is dancing in her fruit adorned costume some of it falls off. A shot of the audience and the fruit is back on the costume. Then it's shown falling off again.
Continuity mistake: When the condo manager shows up at Billy's house to take Purple, and chases him round the garage, some stuff, including a white plastic basket, falls off a shelf twice; first in the wide shot, then again in a closeup of Purple's feet.
Continuity mistake: When Munchausen is about to be executed for the second time, right after the Sultain sais: "Executioner, execute!" we see the executioner raising the axe. The axe is facing the wrong way. In the next shot it's the right way. (01:39:45)
Continuity mistake: In the scene before the race, the butler is leaning against the wall smoking. When he gets off the wall, there is a large grey smudge on his black suit, but the next time we see the back of his suit there is no mark. (00:13:00)
Continuity mistake: Clearly a different guy playing Zack in the beginning as he looks to be over six feet tall and has a full head of combed back brown hair. Zack later on looks like he's only 5'5" with receding brown hair.
Continuity mistake: At the start of the film Christopher Reeve is being chased by a German on a Motorcycle. The Motorcycle used is a Jawa 350 two stroke, but they dubbed a four stroke sound on top. When the chase goes off-road the Motorcycle then transforms into a Motocross Motorcycle. (00:02:00)
Continuity mistake: When Julia's attacker pulls out a variety of sharp kitchen blades, the shears suddenly appear out of nowhere, and then the shears and mallet change their positions between shots.
Continuity mistake: Dan is talking to Barry about how he is the boss. In one shot, Barry is looking down with his eyes wide open. In the next immediate shot, which is wider, his eyes are closed.
Continuity mistake: Wanda wears glasses at first, even acting like the type of person who'd be half blind without them. Yet once she loses them she sees perfectly.
Continuity mistake: Graham is on the bed as it comes crashing down the stairs. He proceeds to disappear, reappear, disappear in the group shot and then finally reappears once again. (00:26:35)
Continuity mistake: Michael Manfield (Danny Pope) walked to the Phillips' house for the in-house music presentations, but on his way home when he was sitting by the lake, his bicycle was on the ground. There was no indication that he had gone home first - he was throwing away the hat he took from Lorna's room, and he was still wearing a tie. (00:38:51 - 00:42:52)
Continuity mistake: At the pool when Sean and Molly are lying on towels discussing their families there is a shot focused on Molly's face, and she says she has a big family and people refer to them as "The Brady Bunch." In this shot you can see a very distinct blond haired man in the pool behind her. The shot then changes to a wide shot showing both Sean and Molly again and the same distinct blond haired man is now behind them on the other side of the pool. (00:14:54)
Continuity mistake: Many editing mistakes with the 'accidents' including the guy at the weight set, when his ribs crack through his skin. In the following shot all is normal again.
Continuity mistake: In the scene in the classroom, when the new student comes into the class with a slip to give to the teacher, he takes the slip from her. Then, the scene cuts to Lou Diamond Phillips following his gang leader out the door. Then, the very next cut, the teacher takes the slip from the student yet again, and tells her to have a seat in the empty desk in the back.
Continuity mistake: When Chris has a gun aimed at Evelyn he's holding it with his right hand. A shot behind him and suddenly it's in his left hand.