Continuity mistake: In the scene just before Miss Piggy and Eileen get fired from the department store, Miss Piggy is watching Kermit and Jenny hug. She then bends a metal pole in half and starts hitting a barrel with it. When she first starts hitting it, the pole she is hitting it with is very thick(much thicker than the one she bent in half), is a different colour and not bent in any way. In the next shot the pole is thinner,longer and looks like the one she originally had, but it is only bent at the top whereas Miss Piggy bent it in the middle. In the next shot of her after that, the pole is now thicker (but not as thick as the first one), is not bent and the colour has changed again. Also if you look around the area where Miss Piggy is, there is only one type of pole lying around, so where did the other two come from? (00:30:15)
Continuity mistake: When the family is getting into the car to go to the wedding one grandmother says to the other "let me in". The grandmother gets out to let the other grandmother in but the first grandmother never gets back in the car, she just pretends to. You can see her hiding behind the cars as it backs down the drive. Both grandmothers are in the car when they see Long Duk Dong on the lawn.
Continuity mistake: When Eddie Murphy is getting the bananas from the waiter in the hotel, the bananas he gets are straight. When he places the bananas in the tailpipe of the detectives' car, they are curved.
Continuity mistake: When Dean Martin's car passes the military-looking Imperial, his red Corvette is suddenly a red and silver Dodge Daytona. It switches back to the red 'Vette in the car's next shot.
Continuity mistake: After the library scene, while the three scientists are walking and talking, a woman in a striped blue and yellow sweater passes by Egon, but disappears in the immediate next angle. (00:21:35)
Continuity mistake: When Jack goes down the mud slide he loses his hat. In the next shot the hat is back on his head. (00:30:55)
Continuity mistake: The first car he jacks is a white 4 door Oldsmobile Cutlass salon, and a 2 door Olds Cutlass Supreme in the next. (00:09:30)
Continuity mistake: When Warren is playing the electronic chess game, the hand on the chess arm that Warren shakes after the game appears from nowhere.
Continuity mistake: At the end, after Mahoney kisses Karen, she takes off her hat and the position of her fringe changes between one angle and the other.
Continuity mistake: Alex comes to work very hungover. He proceeds to spill coffee on his shirt twice. He then talks with Lisa in his classroom and now the shirt is clean.
Continuity mistake: When Rand is showing the old man his invention, he pulls the toothbrush up, and it is facing away from him. When the shot changes the toothbrush is now facing him. (00:02:30)
Continuity mistake: During the second "break fight" against Electro Rock in the club, there is a shot of Turbo wearing a grey windbreaker while Ozone is dancing. In the next shot he is putting the jacket on and when Kelly gets on the floor, the jacket is nowhere in sight.
Continuity mistake: When Matthew is shaving and Jennifer is distracting him, the cut on his cheek changes position throughout the scene.
Continuity mistake: At the beginning of the movie, Selena drives her car to the right side of the house. When the shot changes, the car is several feet further back and is now heading across the front of the entrance.
Continuity mistake: When Tom Hanks is in the dinghy by himself, the outboard motor has no cover. He falls into the water and the dinghy circles him several times. One of the shots shows the motor with its cover in place. (It is an Evinrude motor). (00:22:15)
Continuity mistake: In the scene where Hector is talkin to Samantha and Regina in the radio station, just after they met, Hector is taking off his gloves. Then they switch over to the girls and when they switch back to Hector, his gloves are back on and he starts taking them off again.
Continuity mistake: Just before Melvin has sex with Sarah, Sarah's red dress straps fall down off of her shoulders, yet are back up in the next shot.
Continuity mistake: In one scene, Tom Hanks leaves a room while the last part of "Something Isn't Right" by Oingo Boingo is playing. When he reenters the room, the middle of the song is playing.
Continuity mistake: In the shot after Gilbert is dipped and gets soaked in the fountain by the Alpha-Betas, when he is up on the podium, you notice that he is almost dry, only his head is wet. (01:21:25 - 01:23:00)
Continuity mistake: At the Record Label party, where the band meets Bobbi Fleckman, Nigel is wearing a coat. In another shot where the band meets Sir Dennis Eaton Hogg at the same party Nigel has no coat and different shirt.