Other mistake: When Summer is fighting the Grinders at her wedding, she throws at least four kicks that completely miss her enemy, yet they react as if they were hit with great impact.
Other mistake: At the start of the scene where Mallory says she is going to the premiere with Burt Reynolds, there is an establishing shot of the building. Just over a minute later, the same shot is repeated a second time, as shown by the fact that the cars driving by the building and the cars parked in front of the building are exactly the same. (00:06:30 - 00:08:00)