Revealing mistake: Near the end of the film, when people are running in terror out of the theater and into Times Square, you can see that the people are not leaving any footprints in the snow. The snow must have been digitally added to the scene.
Revealing mistake: Towards the ending in the strip club, Locus is getting arrested. When it shows his hands being cuffed, it's not his hands but those of Charles in an earlier scene. You can tell because the person is wearing long red sleeves and a Rolex.
Revealing mistake: When the Muslim emissary arrives to Jerusalem and Guy de Lusignan stabs him under the chin, look at the blood. It bursts from something attached to his shoulder. In addition, the emissary is seen as stabbed with a small dagger but then Guy De Lusignan is shown holding a full length blood tipped sword a second later.
Revealing mistake: Whenever June is supposed to be playing the harmonica, the viewer can tell she is actually not playing it but just putting it up to her mouth. Her cheeks never are pushed out or sucked in by the air she is supposedly using to play the instrument. Also at the very end when she is playing the guitar it doesn't seem that her hand movements match the music that is heard.
Revealing mistake: About a minute into the movie we see Ethan Hawke waking up. He has a tattoo on his left pectoral. He then goes to the sink and mirror and the camera is directly behind him. He drops out of shot and in the same shot reappears in "the reflection" as he splashes his face with water. His tattoo is still on his left pectoral - all he's done is drop out of shot, move forward a few paces, turns around towards the camera and reappear as the mirror reflection. They've forgotten to either flip the image around or put the tattoo on the other side. (00:06:00)
Revealing mistake: In the scene where Stripes is looking in the water at his reflection, his body and the reflection don't quite match up. You can tell by his movements that his reflection is computer generated. (This is verified by the audio commentary.)
Revealing mistake: When Dekker follows Richards on a motorbike he drives through a glass door with wooden frame. The class shatters noticeably (about a half second) before the bike even touches the door.
Revealing mistake: In the final fight scene we see Matt hitting a guy in the arm with a piece of wood. If you watch closely when he hits him the wood vibrates, indicating it is made of rubber.
Revealing mistake: In the game against Liverpool, there is a reversed shot after Harris scores the first goal. It is fairly obvious since all of the players' numbers are backwards, in addition to the advertisements in the background. (01:45:25)
Revealing mistake: When Chelsea is on the roof of the house and Kathy joins her, Kathy's hair is blowing in the wind, while Chelsea's stays perfectly still, the water in the lake is also perfectly still. Obviously the director had the actors do the scenes separately until we see them both together in which case both characters hair is blowing around. (01:27:40 - 02:00:00)
Revealing mistake: On many occasions throughout the film, Keira Knightley's real, short hair can be seen under her wig.
Revealing mistake: When the Mob's FBI is about to storm the house they shoot the transformer cutting power to the house. But yet when Bruce Willis shoots the fountain in the house it is still pumping out water.
Revealing mistake: After Alex steps off the bus at the same corner as Camryn and Beth, some of the same extras keep walking past in quite a few of the following shots. Two examples are the woman wearing a striped top and black skirt, and the man wearing a plaid shirt and tan pants. (00:09:25)
Revealing mistake: When Ben falls from the roof and into the leaves during the storm, you can see the mat that he lands on move from under the leaves.
Revealing mistake: In the shot when Rosario cries in silence with her dead brother at the bed he moves the little finger of his left hand.
Revealing mistake: After Majid commits suicide, he is breathing.
Revealing mistake: When Charles Shine arrives at the bus station in the pouring rain, the background on all sides of him can be seen to be pure sunshine and dry land. It is obvious that a rain machine covering a VERY SMALL area was being used.
Revealing mistake: When Hayden is talking to the Psychiatrist in the Hospital, he is wearing some type of white powder face makeup to make him appear more "ghostly". This makeup was only applied to his face. Whenever they show a side shot of his face and neck during this scene, you can see the demarcation (line) of where the white powder face makeup ends and his natural darker tan neck begins. (01:05:20)
Revealing mistake: When Avner finds Carl dead in the hotel bed, you can see a pulse in Carl's neck.
Revealing mistake: Jim's town is called "Cromwell", yet in the scene in which he steps from his van to enter the bar, there's a sign mounted on a street lamp which says "Historic Goshen". (The movie was photographed in the town of Goshen, as indicated in the closing credits.).