Visible crew/equipment: When Deck Shifflet (played by Danny DeVito) and another actor are calling their office from a payphone, in order to setup another law firm, once the call has been completed and there is some back and forth between the Danny and the other actor, a crew member is entering the scene via a side alley, more humorous is how said crew member leaves the scene, on realizing that he has just walked onto a live set, the crew member proceeds to stop and walk in reverse out of shot. (01:13:57)
Revealing mistake: During his final speech Rudy projects a video of Donny Ray on a screen. When he rolls up the screen at the end, the projection of Donny Ray's face should still be visible on the wall behind. (01:57:45)
Chosen answer: I don't know why, but he asked not to be in the credits.
Josh Appelbaum