Revealing mistake: In the morgue scene where Will Smith and Martin are checking out the "fat does" for evidence, Will asks Martin to check a coffin for clues. As Martin looks through the coffin there is a shot of money that he finds inside the casket. If you look closely at this shot, the top bill in the bundle of hundreds reads "to be used for motion pictures only."
Suggested correction: May have been fixed in the DVD - I couldn't see anything untoward.
This was, in fact, digitally fixed for the DVD, although just for the most conspicuous shot, the close-up of the money stash. When, a moment later, Martin Lawrence holds wads of bills in hand, you can see they have some sort of odd stamp on them that wasn't there in the close-up. I don't know if there's a screenshot of any version of the movie before the digital correction; you can see the actual props have been for sale at online auctions, though.
