Continuity mistake: In the 'Gaston' song sequence, near the end, Gaston is sitting in his huge antler chair with Lefou. In the wide shot, there is a bear rug behind the chair. The camera does a close up of Gaston, then in the next wide shot, the chair is on top of the bear rug. Also, after this, Gaston gets up off of the chair and in the next shot, both the chair and the rug disappear completely. (00:29:20)
Continuity mistake: The chutes that Wednesday and Pugsley use changes positions when Fester chases Wednesday.
Continuity mistake: When Smee gives Hook his nightcap drink, Hook takes it in his hand and holds it at the top of the goblet so that it is hidden under his hand. But in the very next shot he is holding it by the handle and the whole goblet is now visible with a small black umbrella sticking out the top. Additionally, the position of the small umbrella that sits in the goblet changes a few times. (01:02:40)
Revealing mistake: When John tries to stop the van while Maggie is driving, because he sees the small girl in the road, as the van screeches around the road, you can see the road is covered in tyremarks from previous takes. (00:20:10)
Audio problem: As Fred slides down the banister he cries out "Whee!" but his mouth remains closed. (00:16:50)
Continuity mistake: The king's youngest daughter climbs down a wall and drops a tightly sealed Erlenmeyer flask (invented centuries later) filled with a toxic potion. The flask is full when it is dropped, but partly empty after it has been caught and handed back to her by her spouse's earlier visitor. (01:08:40)
Continuity mistake: When Daniel and Julia visit the Past Lives Pavilion, they show everyone coming in to where the booths are in a single line. The PA announcement tells them to take the first available booth on the left, yet they all walk to the end of the row and THEN pick a booth.
Other mistake: Just before the evil robots capture Bill and Ted's girlfriends, after they crash through the window, the girlfriends ask the robots: "Who are you?" and Bill goes "Well, I'm really Evil Ted!" and unzips himself and out pops Evil Ted, and the other robot goes, "And I'm really Evil Bill!" and out pops Evil Bill. When the robots are herding the girlfriends out just before knocking them out with their breath, you can see two sets of clothes in the bottom left corner if you watch closely.
Continuity mistake: The position and intactness of the biscuits changes between shots, as Louison puts the sugar pot on the biscuit plate because the tea begins to overspill from the cup. (00:27:20)
Continuity mistake: During the big fight scene near the end, the baddie manages to drop the hero down an elevator shaft in a warehouse. The scene ends with a shot looking up the shaft at the bad guy laughing demonically, looking pretty mucky and with hair all over the place. Cut to the next scene where the bad guy appears in a room where the shield beam is generated. Now he is completely clean, has a different hairstyle, and if I remember right has a completely different costume on. (This is because the final fight is actually a combination of two separate scenes - the scene in the elevator shaft was originally meant to come halfway into the film, but the scenes around it were cut, so it was added into the final battle. It has been restored to its original place in the "Renegade" cut of the film, but this mistake is still present in the theatrical version).
Continuity mistake: As William Lee types the "Report On The Assassination" in the café, letters that were visible in a previous shot disappear. (00:32:10)
Continuity mistake: As Harris and Trudi are driving down the freeway, while having a shootout with other drivers, Harris hits a water container on the truck next to them and water sprays across his windscreen. In the next shot (which is wider) the windscreen is completely dry and remains that way for the rest of the scene.
Continuity mistake: Towards the end of the movie, when Dr. Alex Tremor goes to see Marina Lemke, he enters her apartment and it is light outside. He stays only long enough to have a 5 minute argument with her. As he exits her building, it is very dark.
Continuity mistake: When Jason and The Count duel, the cut on Jason's cheek is already there before The Count cuts him there. By that point, Jason was only cut on the shoulder.
Continuity mistake: When the red haired woman is undressing to enter the jacuzzi to kill the guy, her red dress is either on top of the white robe, or next to it, depending on the shot.
Other mistake: Jack gets hit in the face by a car trunk but when he wakes up later there's no cuts or bruises on him.