Character mistake: In the scene when Jennifer Aniston is driving in the parking lot to take her kids to meet Brooklyn Decker, she is driving a Chevrolet. At the end of the movie, when she's confessing to Nicole Kidman, she states that she drives a Honda.
Character mistake: Gail reads right through Katie's poor excuse about crotcheting, and says she won't go to the ball "after what you pulled today with Guy." She did not do it (well she didn't do anything, but 'supposedly did') today, but yesterday. (00:31:00)