Continuity mistake: In the scene near the end of the movie where Peter apologizes to Joanna, Joanna is shown either in her red shirt and holding her blue jacket, or wearing her blue jacket. For instance, as Joanna is moving in to kiss Peter, she is holding the jacket, but as they embrace, she is wearing it. In the blue jacket cuts, it is much less windy, and Joanna's hair is styled differently than it is in the red shirt cuts, where her hair is blowing due to the wind. (01:16:20)
Continuity mistake: During Tom's BBQ when Michael Bolton and Samir are asking Tom's lawyer about prison you see Michael lose grip and drop his cup with a piece of ice hitting Samir in the head. When the ice hits him he's holding the cup in his left hand but when the camera angle changes the cup shows up in his right hand. (01:01:30)
Continuity mistake: When Peter goes to see the Bobs for the first time, he comes in, there's the Bobs sitting on the right side of the desk, and the row of empty chairs on the left. One of the chairs is not pushed in and turned left but when Peter comes back to sit down after getting his water it is pushed in and straight. (00:34:55)
Continuity mistake: When Peter is shutting his computer down to try to escape his boss, one of the cuts shows that it's an Optiquest monitor (us computer people will recognise this), then they cut back to Peter, back to the monitor and there's a piece of black electrical tape covering up the company logo on a completely different monitor.
Continuity mistake: In the scene with Samir, Michael, Peter, and Tom in the office talking about Tom's 'jump to conclusions' mat, the army men in the background on Peter's cubicle change positions. Shots of Michael show the kneeling man with the bazooka on one side of the minesweeper, shots of Peter show them in reversed positions. (00:12:30)
Continuity mistake: When the guys go to Flinger's for coffee, we see that the little cardboard triangle thing in the middle of the table advertising new additions to the menu (most restaurants have these) is facing the camera with 3 lines of text reading "Try our Jalapeno Poppers." In all the shots with that triangle thing in it after that, it has 5 lines of text facing the camera reading something different.
Factual error: All of the computers show a Mac OS when they're booted up. However, when Peter is shutting his computer down to try to escape his boss, the computer shuts down to a C: prompt. For those not technically minded, a C: prompt is only seen on IBM-compatible PCs, never on Macs. (00:19:20)
Continuity mistake: When Peter is on the freeway thinking of changing into the left lane, the vehicles are different between the shots of his face and the shots looking ahead. Then when he changes lanes there was a Mitsubishi Mirage in front of him and a blue Dakota truck a few cars ahead, yet both are gone when we see the lane he left begin to move. Then when he changes back into the right lane, we see a motorcycle up ahead in the lane he left, yet in the next forward shot, the motorbike is gone. (00:01:05)
Continuity mistake: In the scene where they are smashing the copier, they show a slow-motion of Samir lifting his right leg to smash the copier, the camera cuts away and then comes back showing him coming down with his left leg instead of his right.
Continuity mistake: When they meet at Flingers to eat lunch, sometimes his coffee is steaming and sometimes not.
Continuity mistake: In the scene where Peter and Michael are in Michael's apartment discussing his idea for a virus, we see Michael put down his beer on the table. The camera cuts to a shot of Peter and we see Michael from the side. He puts his beer on the table and just as he sets it down the camera goes back to a shot of Michael from the front and his hand is behind the beer in a sort of fist. There's no possible way he could have set the beer down and removed his hand from it in the time it takes to switch camera shots.