Continuity mistake: When Cameron Diaz is telling her husband about Kent, there is a boat outside the window. The boat moves in a weird way. It goes from one side to the other in the same camera angle.
Continuity mistake: When Lee goes to see her father, she gets up to leave and Cahill has his cigarette in the left side of his mouth, when the scene cuts to Lee leaving it is in the right side of his mouth. When they do the close-up it is back in the left side of his mouth.
Audio problem: Sydney is walking towards Jimmy, shooting - there are 4 bangs but only 3 flashes from the gun. (01:34:25)
Other mistake: Janet had a revolver that can fire six bullets but, when she fires it at the werewolf, she fires eight bullets.
Continuity mistake: When David goes into the Dodson Hotel to look for Eddie, the glass door he enters through is completely normal. When he runs out chasing Eddie, he goes out the same entrance and this time the right glass door has a huge hole and is shattered. (00:47:40 - 00:49:35)
Continuity mistake: During David Leary's writing class session, Kirby's pen on his table disappears.
Other mistake: During a serious conversation between Kathy Ireland and John Enos she covers her mouth and it's obvious she's laughing.
Continuity mistake: When Janice and Guy are lying on the stairs of his loft apartment one of her shoes falls off. In the next shot it's back on her foot.
Continuity mistake: When Alex is walking around nude in just high heels watch carefully. They seem to come and go during the gun battle.
Plot hole: Spyro says to Rafael the gun dealer that they need the "hardware" (guns) cause they're going to be hit, but in the scene before we see the Diablos already hitting them after the Mayor finishes talking to the police over the phone.