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.
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.
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.
Continuity mistake: In the restaurant scene the volume of the water in the glass in front of Jennifer Aniston continually changes from full to half-full depending upon whether Aniston or Livingston is talking.
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 where Lumbergh is talking to Milton in the building basement, his ever-present cup of coffee switches hands between shots.
Continuity mistake: When Lumburgh meets with the Bobs, Dom is sitting beside him during the entire meeting. However when Bob Slydell pulls Lumburgh's personnel file, Dom has disappeared from the room.
Factual error: Following on the previously submitted mistake about the MacOS and the C: prompt, when Michael is loading the penny-fraction program he is using a Mac but his hand is on a two-button mouse, which Macs don't have.
Continuity mistake: When Lumbergh is talking to Milton in the basement, he is finishing his piece of birthday cake. He throws the plate out in a nearby garbage can, then suddenly has a cup of coffee in his hand, when Dom comes running after him.
Continuity mistake: When Michael gets pulled away from beating the copier, he has a cord in his hand which he drops before going back. They pull him away again and the cord is gone, but in the last shot it in his hand again.
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.
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.
Continuity mistake: Towards the beginning of the movie when Peter Michael and Samir are at the diner for the first time, Peter notices Jennifer Aniston and she has two full plates of food in her hands. Then she gets into some heated argument with her boss and they cut back to Peter and the guys again and back to Jennifer but this time she doesn't have the plates.
Revealing mistake: When the guys go to see Tom at the BBQ, he has his head in a support cage. Every time he moves, and particularly when he laughs, this cage moves around and wobbles. The point of these cages is to keep the head still and in line with the spine, and are bolted into the bone itself. Therefore, not only should it be impossible for it to be moving, it would seriously hurt if it was.
Continuity mistake: In the scene where Michael and Peter are in Michael's apartment, sitting and talking, we see Michael has a blue shirt which is spot-free. Right before they cut to the scene at the bar, we see that he has 2 small stains on the upper right of his shirt.
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 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.
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.
Continuity mistake: In the scene in the beginning of the movie where Peter is talking to Bill about the TPS reports, we see his computer monitor and the text on it is blue. Later, when he's trying to shut his computer down to escape work early, we see that the text is now yellow.
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.
Continuity mistake: When Joanna and Peter first meet in Chotchskies, note the differences in Joanna's upper body (placement of hair on shoulders, placement of arms and hands, shoulder tilts, and so on) as the film cuts a number of times from Peter to Joanna and back again. For instance, we see her grasping her arms, and a split second later her arms are at her side.
Continuity mistake: In the scene where Peter, Michael and Samir are consulting with the crack-addict magazine salesmen, you will notice it is dark outside. The next scene is Bill's birthday party during the day at the office where they discover money is missing. Then the next scene is back at Peter's apartment continuing the scene where it happens to be dark again.
Continuity mistake: In the scene after they leave the hurt guy's party, and they are in the car, Joanna's hair appears different: when the camera is on her the hair is blowing in her face though when the camera is behind her and focused on Peter her hair is behind her ear and not blowing at all.
Continuity mistake: When they meet at Flingers to eat lunch, sometimes his coffee is steaming and sometimes not.