Continuity mistake: When William is interviewing Anna in the hotel suite, behind the lever door handles, there are two wide, brass, open lattice finger plates, which change to narrow, brass, closed lattice finger plates. (00:27:30)
Continuity mistake: The licence plate of the taxi which hits Sebastian in the end changes during the shot. (01:27:35)
Visible crew/equipment: When Finch is running to the toilet, a microphone wire is visible trailing down the inside of his shirt. This is pointed out in the DVD commentary. (00:58:15)
Continuity mistake: During the scene when Thomas Crown is sailing, you can see the weather change from very dark and stormy, to just cloudy, to blue sky and sun, depending on the shot. (00:36:30)
Continuity mistake: In the scene when Gin and Mac are in the elevator, Mac puts in the keycard and presses 86. You then see the position indicator (PI) which shows the floor (70) in an LED, a red up arrow, and the words "EXECUTIVE FLOOR ACCESS GRANTED" in a red box. But when they are trying to escape, after Mac disengages the Door Hold button, you see that the PI has changed. It is all one colour and the floor number is written in a computer font. (01:22:15 - 01:28:45)
Continuity mistake: When Kat and Patrick are in the car after the party, when they're driving there's no rear view mirror, but one appears once they stop. (00:49:30)
Factual error: In the montage sequence showing Drew Barrymore hanging out with the math club, they have a Pi poster with 3.1457869986. Only the first 3 digits are actually correct. (Pi = 3.1415926535897...) (00:25:20)
Continuity mistake: When Bill Lumbergh pulls into his parking space at Initech, the sign reads "Reserved for Bill Lumbergh, Division V.P." When Peter later pulls into the same space the sign only reads "Reserved for Bill Lumbergh." (00:02:50 - 00:41:05)
Continuity mistake: When Maggie and Ike are talking outside at the luau, Ike's flower necklace is in a different place every other shot. (01:11:15)
Visible crew/equipment: In the scene where Amanda Peet goes crazy in the restaurant and throws the china around, there is a mirror on the wall of the restaurant, in which you can clearly see the lower half of a man wearing jeans in some shots and then in others he is not there. (00:20:00)