Continuity mistake: When Jim and Jennifer are in the kitchen and Jennifer is commenting on how she thinks her boobs have gotten bigger, Jim is squirting ketchup onto his plate. When he first does this the ketchup goes everywhere all over his plate, cuts to Jennifer and then back to Jim and the ketchup is now in a nice neat pile.
Visible crew/equipment: When Bruce goes back to the building toward the end of the movie looking for God and finds it deserted, as he runs through it, you can see the shadow of a figure (a crew member) on one of the columns on the left. It even slightly moves as he's approaching the ladder as if trying to duck away from behind.
Continuity mistake: In the diner, Bruce is looking out the window and the waitress walks up to him. You can see the two coffee cups on the side of Bruce's table next to each other. When the waitress asks "Coffee?" and the shot changes, one of the cups is suddenly at the centre of the table.
Continuity mistake: In the scene where Bruce is confronting the gang that beat him up earlier, he has the monkey come out of the guy, who falls to the ground in pain. After the other guys run away, there is a shot of Bruce taunting them, but the injured guy is not on the ground behind him, even though he should be visible. A second later, he reappears when Bruce turns to face him.
Visible crew/equipment: In the scene toward the beginning where Bruce is doing the cookie line in the mirror, Sam is in the other room peeing on the couch. When the shot changes to Sam, look to the far right and you can see a finger pointing to where the dog should be looking. The dog even appears to be looking straight in that direction.
Continuity mistake: Grace and her sister are at the Asian spa getting massages. The Asian woman walking on Grace's back steps all the way up to the base of her neck. The camera cuts to a different angle and the woman's feet are back down to the lower/middle portion of Grace's back.