Continuity mistake: Near the end of the film, as Aaron/Roy reveals his deception to Martin, notice the jail cell 'door' behind Martin. During the majority of the scene the door is closed, but in a couple of shots it is wide open.
Continuity mistake: There is a scene where Al Pacino is getting dressed for a dinner while talking to one of his aids. He addresses the aide and is seen in a dressing gown with his hair all tousled and untidy. He turns away from the camera, looks in the mirror, and turns back to camera. Miraculously his hair is now tidy as can be, with not a hair out of place!
Continuity mistake: Montgomery's shirt, when he is ripping pages out of a book, is blue. However, when Azazello takes the gun from his hunting vest, his shirt is white.
Other mistake: Just as the gang are off to pick the plants they need Faith goes off to talk to Daniel. While she's there the others woop and laugh, but they do it once and it's recorded. It's played 3 more times, straight after each other. Sounds slightly stupid.
Factual error: Throughout the movie, we can hear Ash's motorcycle shift gears, but we can see that his hands never disengage the clutch, a must do for a smooth shift like we hear.
Continuity mistake: There is one scene at a party where a guy drives off in a car. When he gets into the car, it is facing up the driveway with another car in front of it. When he drives off he drives straight ahead, without reversing down the driveway.
Continuity mistake: When Billy finds his old friend outside of the hotel, he has a grey sweater on. Then when they go into the hotel room, his sweater is green.
Continuity mistake: In one scene, Zane disturbs a lecture on terraforming at JPL and gets thrown out by security guards. Later on in the movie, somewhere in a Mexican bar, Zane and Ilana are discussing global warming. In a flashback Zane remembers the lecture at JPL. Strange thing, however, he can even remember a part of the lecture which was given at a time when he had already been thrown out.
Continuity mistake: When Jessica confronts Dr. Fenistone in the doorway, which shoulder her ponytail hangs over changes between shots through the scene. (00:55:55)
Continuity mistake: When James first meet Helen and Vaughn in the hospital, Helen starts to walk away while Vaughn is examining James' scars. You can see that Helen is almost at the other end of the corridor but when Vaughn finishes examining James, he walks towards Helen who is only a few meters in front of him.
Continuity mistake: During the scenes on the makeshift snowboard Jackie uses to evade the skiing soldiers, every time you see Jackie's face he is standing left foot forward on the board, but whenever you cannot see his face he is standing right foot forward. (00:19:45)
Continuity mistake: At the pool, Dosmo's grip on his gun repeatedly changes from one to two handed between shots.
Visible crew/equipment: When Matthew walks from the hospital to the pharmacist to steal the prescription for their baby, the trolley camera and the guy pulling it are reflected in the shop window.
Continuity mistake: The last time Shakes serves as an altar boy for Father Bobby, he puts the white coat on top of the black gown, and it is all straight. Yet, when he turns to Father Bobby, the coat is lopsided and hangs over his left shoulder, and Father Bobby straightens it again. Even if the coat slides a little when Shakes leans towards the mirror right before turning to Father Bobby, it wouldn't pass his shoulder unless he did it on purpose. (00:28:20)
Factual error: The geography throughout the film is all wrong. The setting is in Pennsylvania, near Pittsburgh. The driving times between there and Williamsport are extremely under-estimated. Most egregious is the river structure. The body is found in the river near Sunbury. Not possible from a site in Western PA. Basically all relationships between actual towns/cities mentioned are totally wrong.
Continuity mistake: Before Halleck eats the cursed pie, a fork appears next to the pie between shots.
Other mistake: The Mongolian guy is supposed to be knocked out cold - however, he appears to smile upon being knocked down.
Continuity mistake: When Hugh Grant first goes underground and is interrogated by the "Mole" people, his arms are held behind his back and the hair on his forehead changes between shots. His hair appears combed back in several shots and some wisps hanging down in others. They alternate back and forth between shots.
Visible crew/equipment: A safety cable and harness are visible during the fight scene, on top of the industrial complex.
Factual error: Toward the end of the film, Matthew McConnaughey is in his office late at night and hears someone outside (it turns out to be his wife). However, McConnaughey draws a revolver from his desk drawer and we can hear (but not see) him pulling the hammer back to cock the gun. Problem is: When pulling back the hammer on a revolver, the cylinder turns to rotate the next bullet into position. The cylinder did not turn. The sound we heard was obviously added by the sound editors after the scene was shot.