Continuity mistake: When Bullock is warning Reeves of the coming winter blizzard, she is looking through pictures that depicted her and her friends enjoying the snow. She then turns to the dog and asks "Remember that day? You were not happy". However it's revealed that both characters have the same dog, given to Bullock's boyfriend by Reeves, so when the snow happened in Reeves' time - 2004 - the dog was with him.
Continuity mistake: As Dalton stands inside the bank vault staring at the cash, the scene jumps from a wide, distant shot, to medium, to close-in, just outside the cage. Another robber stands just outside and between jumps his gun position shifts from relaxed to raised to relaxed again.
Suggested correction: Whilst this is true, I don't think it is a continuity mistake. It looks to me like it is intended to suggest the passage of time between each of the three shots.
Continuity mistake: When Troy is in the locker room with his teammates, Chad is handed the framed photo of Troy's father and there's a white sticker on the back of the frame. In the next shot, when Chad gives the frame to Troy, the sticker is gone. (00:58:50)
Continuity mistake: Right after Queen Latifah hits her head and is having a fantasy, LL Cool J is unbuttoning his shirt. The scene cuts to Queen Latifah and when it cuts back his shirt is buttoned up and his tie is tied properly. It cuts back to Queen Latifah and back to LL Cool J where his shirt is now once again completely unbuttoned. (00:14:00)
Continuity mistake: Watch the newspapers on the front of the bus when Mos Def is getting off. At one point there is a big hole and you can see out, but in the very next shot a newspaper is covering it again.
Continuity mistake: In the scene where Sophie finds the cross key behind the painting, her hand is holding the painting while the key falls, but in the next shot, her hand isn't touching the painting at all.
Continuity mistake: Mina Hoyt's bra strap before the vault was a white strap. After she completed the vault, the bra strap changed to hot pink. (01:19:05 - 01:20:00)
Continuity mistake: When Ellerby attacks the guy for not installing the cameras in the right place, he knocks off a map from the board. A second later Ellerby is still going after him, and the map is fixed.
Continuity mistake: When Harold first meets Ana there is a floury handprint on the front of her apron (on her chest) that disappears and then reappears.
Continuity mistake: The inside of the plane to Japan is a Boeing 747, but outside it's a 737. (00:11:40)
Continuity mistake: When Madea is in the car coming back from court, Nikki smarts off at her and Madea turns around to hit on her. While this is going on, you hear brakes squealing and the driver is moving the wheel like the car is out of control. Yet, the background never changes, stays level throughout this scene.
Continuity mistake: When Leonidas, and presumably all the other Spartans, use their spears to clear their shields of arrows after the arrow shower from Persian archers, the tips of the arrows are still visibly left on all their shields. In the next shot, when the Spartans regroup for the Persian cavalry charge, the arrow tips are gone. (Granted, this is a highly stylized movie based on a comic book, but that does not change the fact that this is a continuity error.)
Continuity mistake: In the fight scene at the party, Jake gets hit over the head with a bottle and he has blood on the top of his head. It changes constantly throughout the fight. It disappears totally when the fight is over. He has no blood anywhere on his body.
Continuity mistake: At the first few scenes of the film the natives are shown with dark, broken and corroded teeth. Halfway through the movie the main cast show pearly white teeth.
Continuity mistake: Nick goes out of his office and to Bristol's desk. Bristol starts standing up. Camera angle changes to Nick then back to Bristol. He starts standing up again. (00:40:40)
Continuity mistake: When Ryan Reynolds is between the two hospital beds, preparing to pull the plugs, there are three wires he grabs to our left (two white and one black). He yanks all of them out (along with another white one to our right) and no plugs remain in the red outlet cover on the wall. But in close ups, as the other agents are banging on the door, we see the lone black wire is still plugged in. (01:40:15)
Continuity mistake: In the morgue scene, the coroner states that Elizabeth Short had a wound inflicted on her right hand, but then in the pornography scene, she grips the bed post with her left hand.
Continuity mistake: When Andy and Miranda are in the limo in Paris, they pull up to the curb and there is a bunch of press waiting as Miranda opens the door. However, when the shot changes, it is not the same group of people - in particular, there is a balding photographer who should be standing right there but is nowhere to be seen. It all happens too quickly for that much change.
Continuity mistake: Hugh Jackman puts a tan vest on twice in the scene when we first meet his wife.
Continuity mistake: When Jerry and the Dr. are talking in the tent the first night on the way to the mountain, the Dr. shows Jerry a notebook with a picture of his wife and son. Jerry hands the notebook back twice in a repeat of the same shot.