Continuity mistake: When Leo and Max first meet, Max throws water on Leo. When Leo leaves the office his shirt is magically dry.
Continuity mistake: Near the end of the movie, Max is yelling at Franz Liebkind in his office. Franz sits on the couch and looks very sad, about to cry. It cuts to a wider shot, and Franz is now slightly turned to the side, sobbing quite a lot. [Visible only in the widescreen version].
Continuity mistake: Before Leo and Max leave to go see Franz Liebkin and Roger DeBris, the apartment is a mess, with unread plays, pizza crust and drinks, but when they return the apartment is spotless.
Continuity mistake: In the scene where Max and Leo are trying to persuade the director to join them, his "Chrysler Building" dress changes between shots during the song. In the close up shots, one side of the collar has got caught inside the dress, then it cuts to a longer shot and it is all outside again. This happens several times during the whole routine.