Other mistake: In the scene where Marcus and Kevin are first dressed up as the Wilson sisters, as they step out of the limo, Kevin (as Brittany) tells Marcus (as Tiffany) to act like a normal girl. Then Marcus flips his hair and the part in his hair is now crooked because he didn't get all of his hair back to one side. The next time you see him, the part in his hair is straight, and his hair is no longer out of place on top of his head.
Other mistake: When Marcus' wife is at the restaurant, she hands her credit card to the waitress who comes back just a few seconds later to not only tell her the card was declined but to also have an agent on the phone. Given the scene is shown in realtime - there's no way all that could have been accomplished in just a few seconds.