Revealing mistake: In the scene where Jalil and Smokey are talking on the race track, after Jalil wipes out in his race: if you look behind Jalil when Smokey leaves, you can see that the man sweeping the floor in the stands isn't actually sweeping at all - his broom is inches above the ground and he is simply sweeping air.
Revealing mistake: During the close-up of the gas canisters, the condensation is running upwards and "into" the valve. (01:31:10)
Revealing mistake: In the playing card target shooting sequence, Colin Farrell shoots an ace from the front but the card explodes from the rear. A squib was used to make the hole in the card, blowing the pieces outward instead of inward.
Revealing mistake: Near the end of the movie, when Johnny Depp's eyes are removed, he talks with the boy when he's against the wall. In several shots you can see Johnny Depp's eyes through the sunglasses. (01:33:55)
Revealing mistake: The Acheron fires many devastating blows on the Surprise and the effect is visible in close-ups and a wide shot. However, after Mr. Mowett yells, "Relieving-tackles on the tiller! You men collect the wounded!" there is another wide shot of the Acheron in the foreground and Surprise in the distance. In this shot Surprise has NO damage whatsoever! (00:11:00)
Revealing mistake: In the beginning of the movie when Al Pacino is supposed to be browsing the web you get a quick look at the address bar. It shows the URL to a local .html file instead of a website.
Revealing mistake: In the chase scene in the subway, Napster stops the subway train at the end of the tunnel to block the tunnel entrance. When you see the view on his laptop, the train station CLEARLY has a metal railing. There is no such railing throughout the rest of the scene. (Yes, it's likely while filming that railing was removed to enhance the scene then put back.) (01:27:45)
Revealing mistake: In the Fredericksburg battle scene, just after the Union officer orders the men to fall back, there is a 1 or 2 second close-up shot of a Confederate soldier taking a hit and falling back. As he does, a modern wristwatch is visible on his left wrist under the sleeve of his coat. (01:49:49)
Revealing mistake: In several scenes of the zombies swimming under water, they are obviously holding their breath. Would a dead zombie need to do that?
Revealing mistake: When Martin Lawrence was trying to get into his car after he supposedly locked the keys in it, you can see in the shot from inside the car that the door was unlocked. You can tell because the orange-red sticker on the lock is showing, which wouldn't be visible if it was locked. (00:10:50)
Revealing mistake: When Watson is standing over Jackie's dead body and says "I'm sorry I wasn't there when you needed me most, my friend" you can see Jackie reflected in the TV standing ready for his queue before entering the picture. (00:41:55)
Revealing mistake: When the "light rail" vehicle is crossing the bridge, several shots reveal that it is not traveling on rails, but on a metal grating. This is most obvious after the police have stopped it. We see a bridge deck designed to carry cars & trucks (in fact, the police have just driven out on it) with strips of metal laid on the surface to simulate "rails". As others have observed, this was filmed on the wrong bridge; this makes it particularly obvious.
Revealing mistake: During the cage fight, Su breaks a man's arm. We can see the break, however we can also see his real arm hidden under his shirt. There is a big lump under the fake arm. (01:01:30)
Revealing mistake: The shots of the aircraft in flight (carrying the liver) at the beginning of the film have been flipped. The "tail number" of the plane is visible and is obviously backwards.
Revealing mistake: When Selene notices the sword laying on the rocks, the sword moves up about two inches between shots, you can judge it by looking closely at the handle of the sword. (01:49:25)
Revealing mistake: At the end when the Monk With No Name has turned old and is walking away from Kar and Jade while waving to them (without looking back), you can see a finger on the left side of the screen covering up the corner and side of the lens. This is for sure in the wide-screen DVD version. (01:37:25)
Revealing mistake: During the scene where Lara and Reiss's henchmen are fighting in the lab with the orb, look closely: the computer monitors in the background briefly flicker (as most monitors appear on camera), indicating they were shot in the background. During the close-ups, this does not occur.
Revealing mistake: At the beginning, when the grandma zombie knocks off that guys head, a geyser of blood pours out. When the body falls forward and the blood splatters the camera, the body lifts up about three centimetres before it falls down, indicating that it is a dummy.
Revealing mistake: When the main characters hide in the "cave" to escape the tsunami, it is obviously man-made. Notice the stripes in the wall behind Steven Baldwin, which are obviously made by mining equipment.
Revealing mistake: When the Bodyguard attacks the rival gang, he stabs one of the torch carriers, to which we get a close-up of. As the blade goes in, blood comes out - when the Bodyguard removes his blade, there is no stab wound, not even in the torch carriers clothes.