Mistake: Gun change
Advance to the mine field scene near the end of the movie . When Detective Mike Lowrey (Will Smith) has a gun pointed to his head, Syd (Gabrielle Union) and Detective Marcus Burnett (Martin Lawrence) have their hands in the air. You can see Marcus holding a silver Sig handgun, which he has been using throughout the movie. Syd will soon toss a gun, you will see Marcus do a roll. From then on, you will see a Glock handgun in his hands for the rest of the movie, instead of a Sig.