Continuity mistake: In one scene, Nick Nolte is driving Eddie Murphy around in a convertible. First you see Murphy in handcuffs, then no cuffs, he's got one arm on the back of the seat, and then back with the handcuffs on.
Continuity mistake: When De Niro's character gets in the limousine with Lewis' character he has a hurt hand. He wraps it with a handkerchief. As the scene progresses the handkerchief disappears and reappears depending on the camera angle. (00:07:15)
Continuity mistake: When Terry Corrigan goes mad and teaches his students at gun point, he asks one of the thugs a question and holds his gun right up to his face. The tip of the gun is almost touching the thug's face, but from a different angle, the gun is further away.
Continuity mistake: Closeau is at his desk preparing to light his pipe. The Pipe is in his mouth as he lights the match, the camera angle changes and now it is out of his mouth in his left hand as the camera zooms in, he puts it back in his mouth to light.
Continuity mistake: When Poirot and the others get ferried to the island the pile of luggage at the bow is arranged differently when they arrive. (00:15:30)
Continuity mistake: Near the beginning when the guy is robbing the liquor store, he's holding his gun with one hand. In the next shot, he's holding it with two hands.
Continuity mistake: Myra Bruhl is popping pills at the beginning of the movie; when she puts down the container, there's a white-labeled bottle on the bedstand that was not there before. (00:02:40)
Continuity mistake: When Sheriff Stevens is arresting John, he has his hand on the back of John's shirt collar as he lifts him up. But in the next shot, his hand is grabbing John's hair.
Continuity mistake: John is helping Mr. Nardini at the beginning of the movie. The box breaks right away and spills its content on the doorsteps, and the various items (pay attention to the blue bags of pasta for instance) shift position at every cut. (00:03:50)