Continuity mistake: When Tapia is giving the mural artist a dressing-down, his daughter has a book in one hand for most of the scene, but when the shot changes to one from above Tapia and his daughter, the book changes to the other hand. (02:03:15)
Revealing mistake: When Suki and Tej are being booked for speeding when they took Brian's and Roman's cars, the police officer next to them should be writing on his notepad, but instead the words are already written and he is just moving the pen over these words. (01:24:25)
Continuity mistake: During the scene when Arnold carries the casket, a shot shows many bullet holes on its front side. Two shots later, these holes have disappeared. (00:54:45)
Factual error: When we see the burning 'DD' in Joe Pantoliano's glasses it is not a reflection. The DD should be backwards in his glasses. (00:26:55)
Deliberate mistake: Almost trivia, but not quite. When Mystique's looking through the guard files to find a suitable candidate, lots of photos flash up very quickly before she finds the guy she uses. Of note is that Bryan Singer pops up in guard uniform (with his own name), and so does someone called "Donner, L". This is most likely referring to Lauren Shuler Donner, one of the producers, and sex is specified as "F", but the photo is of a stubble-coated man. (00:23:10)
Continuity mistake: When the Angels are walking through the sprinklers after getting shot, you can see the bullet holes in each one of the Angels' shirts. When they get to the car, and it blows up, Cameron Diaz's bullet hole disappears. (01:20:00 - 01:21:30)
Revealing mistake: In the subway scene, when Neo gets slammed towards the wall (and crashes into it) it's visibly Keanu's stunt double.
Deliberate mistake: When Morpheus is facing the twins' car, the road's not all that wide, and there are concrete barriers both sides of him. After he rolls to the side and slices their car, we see a side shot, quite far back from the road, and the barrier closest to the camera has disappeared (presumably so we get a better view). In a closer view, both barriers are back again. (01:29:25)
Continuity mistake: In the scene where the police car is chasing Ben Affleck and Uma Thurman on a bike down in a tunnel, in one shot, the police car's flashing light on top is ripped off by the low ceiling. In the very next shot, the lights are still on the top. The next shot shows the lights are gone. (01:13:50)
Revealing mistake: When Linderman dashes at Jason and impales him with an American flag, Will is dragging Lori (who is supposed to be unconscious). He's dragging Lori by her arms... but when he suddenly reaches behind his back with his right arm, her right arm stays up in the air. (01:13:50)
Continuity mistake: When Vernita and The Bride are talking in the kitchen and Vernita shoots The Bride from the cereal box, you can see the bullet hole in the back wall of the kitchen, but then a little later that part of the wall doesn't have any bullet holes. Also, not only is the bullet hole not where you see it hit in the first place, it's on the other side of the bride's head, along with the splatter from the cereal box.
Continuity mistake: As Viktor's tomb is opening there is a shot from above showing Selene looking down the opening tomb. Watch the placement of her feet. In the next shot, her feet have moved closer to the opening. (00:44:40)
Continuity mistake: The chain with which El and Carolina are linked together gets cut open with a welding torch. When the chain falls down on the ground it's intact again. (00:34:50)
Continuity mistake: The hole in the car windshield changes size from when the Hulk throws the dog through it to when it's shown the next morning.
Revealing mistake: When the camera shows the coffee cup in the cop's car, you can see the ignition is in the off position. (00:09:16)
Visible crew/equipment: When the Mini Coopers jump out of the sewage tunnel, you can see the black ramp they launch off of to give the tunnel exit more of a dramatic effect. (01:36:15)
Continuity mistake: In the scene where the Sheriff is wrapping the suicide victim's body, he has a roll of plastic wrap. He is shown with the box, then as he begins to wrap the head, he has just the roll, and in the next shot it is back in the box again. He presumably would have left it out of the box the entire time, since the box would only get in the way of trying to wrap the body. (00:33:00)
Continuity mistake: When Steve Zahn and Martin Lawrence are driving away from the police in the junkyard, they hit a car in the junkyard, and we can see the damage inflicted on it. However, in all of the shots following the car is not damaged. (00:55:35)
Visible crew/equipment: When Scott falls after getting hit by the three arrows, you can clearly see a long tube leading all the way up his leg which pumps the fake blood up to his shirt. (00:41:25)
Revealing mistake: Near the end of the film when we see Rhodes shoot Larry in the chest, you can see an outline of something underneath his vest, very obviously a device/squib simulating being shot in the chest. (01:15:15)