Continuity mistake: As Nicole walks across a plaza with Clooney to meet the Russian spy, she is wearing sheer stockings and low pumps. As she walks off the plaza she is wearing knee high boots with fur tops.
Suggested correction: I think what we see from behind, under the coat is dark trousers and dark low heels.
Continuity mistake: In the first scene that introduces us to George Clooney's character, we see him in front of some sort of Judicial committee. The first scene he wearing gold leaves which indicate the rank of Major, although in the movie he is a Lt. Colonel. Then very next scene when we see Clooney he is wearing the correct rank.
Continuity mistake: When Julia is giving a brief to the people in the room about terrorists and such, Tom interrupts and walks over to the screen. In this shot Julia is raising her hand/hands and pointing at him, yet in the following shot her hands have not moved from her side only her head has moved to the mic. (00:23:35)
Continuity mistake: In the fight scene between Tom and Alec in the truck that is hanging over the edge, when Tom is pulled up by the helicopter he cuts the rope and lands on his back. He actually loses his knife which is in his right hand, yet in all following shots its reappeared back in his hand. (01:15:05)
Continuity mistake: When Tom and Julia get out the Mercedes before it explodes, Tom shuts the drivers door after getting out, yet in the following shot it is open. (00:51:00)
Continuity mistake: When one of the snipers accidentally shoots a woman in the leg, she falls backwards onto her back, yet on the closeup shot of her she falls to the side of her not on her back. (01:41:00)
Continuity mistake: Just after George Clooney's friend has been killed, he roars off in his car, banging the BMWs. A bit of plastic each side of the bumper falls open, nearly coming off. A few shots later the car's driving towards the camera and they're both back in place. (00:46:50)
Continuity mistake: When Clooney is fighting in the truck on the bridge, he is pulled up by the helicopter. As the camera follows him, you can see him pulled up at least 10 meters. When cutting himself from the cable he falls back into the car. but only about 3 meters.
Continuity mistake: Just after the explosion in the square, we see a shot of the Mercedes' door, and it's still bright silver. In the shot immediately afterwards of George Clooney and Nicole Kidman getting to their feet, it's charred black. (00:51:10)
Continuity mistake: When Tom and Julia are in Julia's office, Tom sits down while Julia is on the phone and begins to read the small card from the flowers. In one shot Tom's three/four fingers are on the back of the card, then in the following shot he is holding the card at the edge with just his fingertips on the card. (00:26:55)
Continuity mistake: Just after they get the information from the guy's computer, Tom's friend picks them up. His window is up as he pulls up to pick Tom and Julia up, yet the next time we see it a second later it is down then it is back up in all other shots. (00:45:00)
Continuity mistake: When the bomber walks on to the streets of New York, he passes a violinist standing next to a tree. There is a man with a red coat sitting on the trees ledge and a black man standing next to him, yet in the following shot (perhaps 1 second later) the man sitting on the ledge and the black man are both standing up about 4 feet away from the tree. (01:33:00)
Continuity mistake: When the helicopters return to base after capturing the warheads, it does a shot showing both of the helicopters coming from either side of the shot and landing. The next shot from the hangar however, shows one of the helicopters landing again.
Continuity mistake: When Tom's friend gets shot and the other guy starts to shoot at the windshield, the bullet holes change between shots. (00:46:35)
Continuity mistake: Just before the two trains crash, there are 4 poles along the track and not far apart, then when the camera cuts to a wider shot, there are fewer poles and at a much greater distance from one another. (00:14:20)
Continuity mistake: In the subtitles for foreign speaking characters, they can't make up their mind for the spelling of the main bomber: it appears as 'Ducsan' and 'Dusan'.
Continuity mistake: In the beginning of the film the Russian officer presses a code on the back of the train carriage to close the door - the red and green buttons are at the bottom of the panel. Slightly later on when the warheads are being stolen, he has to press the code again, this time the red and green buttons are on the top of the panel.
Continuity mistake: When Tom jumps from the helicopter, into the truck that is hanging over the bridge's edge, the rope that is attached to him remains attached until Tom and Alec start fighting. Then it disappears, and suddenly reappears when Alec wraps the rope around Tom's neck. (01:14:05)
Continuity mistake: When the hijackers are setting the nuclear bomb, they drill a device to the face of the bomb, and on the right of the screen there are wires sticking out of the little silver box. In the following shot one of the hijackers opens the little silver box and pulls the wires out again. (00:12:10)
Continuity mistake: When the Colonel, who is carrying the nukes in the truck, has to stop at a checkpoint, he shoots two guys out at the front of the truck beyond two round small containers, but they suddenly disappear in all the following shots. (01:05:15)