Continuity mistake: In the beginning of the movie, Lazlo is writing on some paper and it shows him writing with his left hand but when they cut away they show him holding the pen in his right hand.
Plot hole: When Jimmy calls Jill in order to get his bag back she is let in on the entire thing and gets to play her part in rescuing Oz and Cynthia. She asks Jimmy if he would have called if he hadn't grabbed the wrong bag to which the answer was no since his intention was to drive her away in order to protect her. Jimmy tells her to remember everything he has told her (which I'm assuming was for her role in the upcoming rescue) but since he tried to drive her away and they had not talked since their big fight when did Jimmy get an opportunity to tell Jill what to do in the first place?
Continuity mistake: Near the end of the movie when Lazlo sits on the couch he has a lit cigarette, the shot cuts to Jill then back to Lazlo his cigarette is not lit then in the next shot it is lit again.
Continuity mistake: In the scene where Oz and Jimmy are in the bar drinking shots, Jimmy's arm switches from up towards his head, then down, then up again, while they are talking.
Continuity mistake: In the shot where Amanda Peet is trying to seduce Oz, she drops her shirt. We're supposed to think she is naked beneath that, but we see that she has a bandanna around her chest.
Continuity mistake: When Lazlo and his men raid Oz's house, all of them have a chat in the living room. Watch the men standing behind Lazlo. Their positions, as well as the number (3 or 4 men depending on the shot), keep changing around.