Best thriller movie mistakes of 1980
Continuity mistake: When John is in his Manhattan apartment reminiscing, we see his daughter throw a ball at him. If you take a close look at the ball, you will see how beat up it is. However, when the ball is falling down the stairs in his rented house for the first time, it has become new and shiny.
Audio problem: In the last scene of the film, when Gere is in prison and talking to another using the telephone behind glass, we hear his voice as if via a telephone. Most of the speech is done this way then for the last line he puts the telephone down on the desk, but we can still hear his voice as if he was still using it.