Revealing mistake: At the beginning of the HBO broadcast, some brief clips of Mason "The Line" Dixon in action are shown. Look closely at one clip where he's wearing white trunks, and you'll see "TARVER" written across the front in big black letters, revealing, of course, that it's a real-life clip of boxer/actor Antonio Tarver.
Revealing mistake: When Bobby is being chased by the police in his Dad's car it is blatantly obvious that a stunt double is driving.
Revealing mistake: At the end of the movie when the cheer squad is shooting the video with Rhianna, she is wearing a blue shirt. The shots cut back and forth between the reality of them shooting the video in front of a blue screen and what the video looks like with the effects. If Rhianna is wearing a blue shirt and is filming this on a blue screen, she would appear to have no body when no one is behind her.
Revealing mistake: In the scene where Luigi offers his service to Van and Minny, Guido is juggling wheels. But when Guido finishes, you can see over his right lift that his one of his wheels is not rendered correctly, as it seems to overstep his bodywork.
Revealing mistake: The reaction of the jogger being hit by Clark's bat is way too late.
Revealing mistake: When the speaker during the first game played says "This game might have had a different outcome", everyone in the crowd looks at a different spot, but the small kids agree on just looking straight into the movie camera. (00:01:25)