Character mistake: When talking about poker Jimmy asks Dave "What are the chances of getting five of a kind of the same suit?" The most you can get is four of a kind and they would be all different suits.
Continuity mistake: When Lisa is helping Joe with the test he gets her a soda, he puts it on the table she then moves it. It is right next to the can of peanuts. Lisa is seen moving the can of peanuts back, there is one shot that shows it now behind the can of soda, then the next shot they are again next to each other.