Factual error: While the tidal wave is enveloping Manhattan, there is a scene where Washington Square Park is destroyed. A large arch is hit by the wave before reaching the rest of the park. The problem is the arch is on the UPTOWN side of the park, not the DOWNTOWN side which according to the movie was the direction the wave was coming from.
Continuity mistake: When Bruce is covering the boy while trains are passing either side of them, at first he has his right hand on top of the boy's head. Then in the next shot he has his hand to the side of his head in a different position. The film cuts back and forth between these shots.
Revealing mistake: When Lola screams and the glass clock smashes, you can see the small pellet that makes it shatter, go through the glass and then bounce off the wall. (00:20:40)
Revealing mistake: In the beginning scene on the Bak'u planet the stone bridge bends under the weight of the child. (00:04:15)
Revealing mistake: During the big gun battle right before the last fight scene, Riggs is shown driving a forklift, and knocking over some barrels on top of Wah Sing Ku, leader of the Triads. When the forklift does the 180° turn, you can see that it is not Mel Gibson, but an Asian stunt man.
Other mistake: When Daniel Baldwin carjacks the guy at the gas station (director Frank Darabont in a cameo) we can clearly see that his car is a Cadillac. However, in the end credits he is listed as "Man with Buick."
Continuity mistake: When Emma is protecting John at the top of the stairs and he says, "I didn't kill anyone," her hand is at her side. In the next shot, her arm is raised in front of him. One shot later, it's back at her side. (00:23:40)
Continuity mistake: In the scene where Michael (Jeremy Piven) kills his brother Adam in the parking lot, you can see that when he pulls out of the parking space, he turns his vehicle around. The camera cuts from an outside view (where Adam's minivan is) to inside Mike's car. If you watch, Mike turns his steering wheel to the left but his car turns to the right when the camera switches back.
Continuity mistake: In the scene in the bedroom where the mother walks in on Gwyneth supposedly naked, she runs and jumps underneath the covers. However, you can see her underwear on as she pulls the covers over her. (00:04:28)
Visible crew/equipment: As Denzel walks into the lodge for the end scene and stops in the middle of the room, the camera rotates to the right and holds position. Now watch the first window at the right of Denzel, some shadow of the crew reflects on the glass and stops on the wall on the left of the window. (01:42:05)
Revealing mistake: During the attack of the Global Sedition on the space station at the beginning of the film, several objects can be seen with dark grey boxes around them - CGI artifacts. One clear time is when Ranger 1 is saying "Damn, can't shake him". (00:02:35)
Continuity mistake: A few times when Emily fights with the intruder, her hair changes from being in a ponytail, to down. (00:46:30)
Continuity mistake: In the scene where they are talking to Snipes girlfriend. Downey says he killed them with his bare hands and shows her a picture of a guy shot twice in the chest.
Factual error: In the beginning, when pi is listed, it reads: "3.141592652631245..." when pi is actually "3.141592653589793...". (00:00:31)
Other mistake: When the main characters are in the motel and they hear the moth flying outside the window, Stu, the creepy deputy with the glasses, picks up a shot gun and racks a round into the chamber. In the next shot of all of people firing at the moth through the window, Stu is now holding his revolver and fires with it. When he runs of out ammo with the revolver he picks up the shotgun again and before firing racks the pump again. Since he already did that the gun should have ejected the unfired shell that was already in the chamber from earlier, but no shell is ejected.
Factual error: When Christian Slater and Minnie Driver are trying to get out of the water before it reaches the transformer, there is a real big problem with this scene. If there really was a flood and it was rising that high, the city should have shut off the electricity to the entire city, to prevent any electric hazards that may happen in that situation.
Continuity mistake: When Vivo finds Pantucci snooping around the cargo, he throws him to the middle of the mercenaries, and they all get around him, including T. Ray who smiles at him; when T. Ray smiles at Joey he is standing up, but when he gives the first kick he is sitting down.
Other mistake: During the rigged card game, the angle at which the hidden camera is shown would not have supplied a picture with the view from behind Eddy's shoulder, as is shown on the screen.
Continuity mistake: In the tanker, the girl and the CIA guy are bound to the chairs. When the tanker is jolted and every person gets pushed away, the girl's hands come loose, as her chair is thrown. Yet in the next shot both her hands are tied again.
Continuity mistake: While the hitmen are kidnapping Nishi's daughter, we see her and her boyfriend in the back of the limo. As the boyfriend is trying to undress her we see that she is wearing ordinary white knickers. Then when Mark Wahlberg lets her use the bathroom, we see him pull her knickers up for her (she is handcuffed), which are now more like hotpants.