Continuity mistake: When Jessica appears on stage, Eddie has Betty Boop standing next to him in all close-up shots, except for a wide shot of the public behind Jessica where Boop is missing. (00:18:15 - 00:19:05)
Continuity mistake: After Ken reverses the steamroller after running Otto over with it, you can see a red patch signifying his splattered body in front of the roller. However, a few scenes later, Otto is seen alive. (Otto was originally meant to die, until test audience feedback influenced a change of mind on the part of the filmmakers.)
Continuity mistake: During the chase scene, Steven Seagal has his tyre shot as he's fleeing from the bad guys. In the next shot, the tires are totally gone from the rims, then they're back again, then they're gone again.
Continuity mistake: When Jack and the Duke are in the restaurant car of the first train, Jack is eating a chicken leg in one shot. In the middle of a sentence he changes to eating jelly and ice cream, which he finishes. In the very next shot his bowl is full of jelly and ice cream again.
Continuity mistake: When mom finds the failed test in Les's pocket, it is folded into eighths. Later, when dad shows the failed test to Les, it has only been folded into thirds.
Continuity mistake: When Mark Harmon's character arrives at Sean Connery's house, as he gets out of the car he slams the door, but the sound of the door comes a few seconds later.
Continuity mistake: When Frank is fishing the pen out of the fish tank and the fish gets attached to his nose, there is visible blood. When the camera cuts back to Frank, the blood is gone. (00:20:35)
Continuity mistake: When the bad guys are outside the hotel in the convertible, they spot Lassard and one of them spits milkshake over the inside of the windshield. The milkshake disappears in the next shot.
Continuity mistake: When Harrison Ford is on the rooftop and the suitcase accidentally opens, the Statue of Liberty goes flying off the rooftop and on to the ground, several stories down. In the next shot, the little statue is perched at the edge of the rooftop. Also, the clothes that fly away magically reappear next to the suitcase a shot later.
Continuity mistake: Anderson (Gene Hackman) visits Clinton Pell's wife and she's talking about Genesis 9, verse 27. In the first shot he's standing right behind her. In the next shot he stands on her left side. Then again right behind her.
Continuity mistake: When Veronica and JD are in the kitchen making the hangover cure to kill Heather Chandler, they both screw the cap back on the Drain Opener. (00:25:10 - 00:26:05)
Continuity mistake: At the end when Michael Jackson is singing come together, at the end of the song his shirt is undone, but when the camera shoots back on him his shirt isn't ripped.
Continuity mistake: About 40 minutes from the end (I think - Michelle Pfeiffer is on a beach with Dean Stockwell), a boom mike comes in from the bottom of the screen very obviously, taking up about a third of the screen.
Continuity mistake: Right before the assasins appear at Frank's office, the coke can that was on his desk disappears.
Continuity mistake: Near the end when they're entering the Mexican village, Billy's coat disappears as he rides through the gate. (01:17:45)
Continuity mistake: In the basement of the Orpheum theater, Holmes takes a lamp off of a wall and places it on the floor. The shot cuts, and the lamp is back on the wall. When the shot cuts again, the lamp is back on the floor. (01:29:25 - 01:30:45)
Continuity mistake: Right before Steve Martin and Michael Caine make their bet, Steve walks up to Michael sitting at a little white table. Every time the camera goes back to face Michael his handkerchief in the breast pocket of his jacket goes from sticking way out of his jacket, to barely visible.
Continuity mistake: When the killer is using the R/C car bomb to follow Harry and his partner; as the R/C car approaches Harry's stopped car, it starts to swerve to the left, as if to go around. However, in the next shot, the R/C car is perfectly straight again, and lined up to go under Harry's car.
Continuity mistake: When Danko punches out the man hassling him when he's sat in the car, the man falls left out of shot next to the car, but when Ridzik comes back, the man is now quite a distance away from the car.
Continuity mistake: When Mel Gibson is unwrapping the tarpaulin from his boat, there is less rope shown tied round it in early shots than there is in later ones.