Factual error: In the scene where Robert Redford is hiding in his car in dealer's lot, the FBI say they have him tracked and located, "Got him. Just off I-94 near Gurnee, IL." Redford may be in Gurnee, but the local police speeding to catch him are not: The area around Gurnee is flat as a pancake, yet the police drive by many tall hills and/or small mountains. (01:09:00)
Factual error: Kuklinski is looking at a newspaper which is dated January 3rd 1983, and the text reads that Roy DeMeo was found dead the previous day. In actuality, Roy DeMeo died on January 10th 1983. (01:22:55)
Revealing mistake: When Ray reminisces about having fought the Germans in WW2, a flashback is shown with him fighting in a bunker. He is carrying a No.4 Lee-Enfield rifle which requires the bolt to be worked after every shot to reload. However, he is shown firing two shots in rapid succession without moving his hands at all, revealing the shots to just be flashes added after filming.
Continuity mistake: The objects on the desk at Lax's interview with Herman change several times. Sometimes, the tripod is closer to the center of the desk, about a foot away from the file folder, but other times it is closer to where Lax is sitting and one leg is almost touching the folder. The angle of the file folder and distance to the edge of the desk also varies. The Styrofoam cup switches from one side of the desk to the other. (00:17:07 - 00:18:20)
Continuity mistake: In the underground lab, Dr. Su offers to surgically remove the false memories he implanted in John's brain. He drills a half-inch hole in the right side of John's forehead, which leaves the right side of his face covered in flowing blood. John can't stand the pain, breaks free, and he goes on a rampage throughout the underground bunker, killing every UniSol in his path. As he fights his way through the bunker, the bleeding hole in John's head switches from the right side of his forehead to the left side, then back to the right side again. Also, in the last scene (an unspecified amount of time after the bunker brawl), John has no scar on his forehead at all.
Continuity mistake: The German and British airmen are looking at the Northern lights. From the rear the men are apart, but the front shots of them show them much closer to each other.
Continuity mistake: When Eddie Murphy's assistant makes assumptions about why Jack isn't speaking, he throws his notepad down and has empty hands as Jack pushes him out of the office. When the angle changes, he has a notepad in his right hand.
Continuity mistake: At the end, the heater is on a chair when Sally chucks the locket on to it. After the spirit has been banished the heater is now on the floor.
Continuity mistake: When the mean Santa puts the little girl in his lap and asks her what she wants, she's wearing gloves. When it cuts to a different angle, suddenly her gloves are gone.
Continuity mistake: At the "written by" screen with Al Pacino and Christopher Walken meeting, the shadows of the building run perfectly parallel to the fence and through the whole length as far as it can be seen. The two exchange 30 seconds of dialogue and an awkward hug, and drive off. The shadows have changed entirely; they start about halfway at the gate, with an oblique angle. (00:04:05)
Continuity mistake: The alarm clock chimes; Juno Temple reaches up with her left hand, putting it on the upper part of the pillow. Michael Angarano crawls over her to turn the alarm off, but she's napping with her hand by her chin, on the bottom corner of the pillow. (00:02:40)
Continuity mistake: Tom walks into Anthony's memory. Anthony is sitting by the pool next to a table with two glasses of beer, which are 1/3rd empty. A few minutes later the memory is replayed, but this time both beer glasses are mostly full. (00:49:50 - 00:58:35)
Continuity mistake: Celeste's white Honda (Alabama plate #LF8VN3D) is riddled with bullets right after she drives up to the cabin, but there aren't any bullet holes later after the police show up. (01:26:00 - 01:45:00)
Revealing mistake: In the opening scene, Johnny and Hickey sit in the front seat of a car. Views out the side windows blur, there is a gray background behind Johnny instead of the rear window, and when Hickey holds the cross toward the windshield, the "outside" is all grayish-white. At one point, there is light on Johnny's right forehead, cutting diagonally downward (too linear to be the sun), and another time, there is light behind Hickey on his headrest. (00:00:31 - 00:03:30)
Factual error: When the underground garage of the market is flooded, the car that Kyle and Heather are in does not flood. A car is not water tight like a submarine. Even though the water does not cover the top of the car, water would flood the entire car within minutes.
Plot hole: The killer has been living in the (apparently big enough) crawlspace between walls and floors, for over a decade. There is no explanation (or rationale) given on how he moved the various objects inside every room, closed doors, fed when the house was not occupied, hid the various corpses and, silly detail, concealed his own BO and the stench of his own living quarters, which is something hinted at when they find out his hideout. It is explicitly said that he is agoraphobic and does not get out, ever.
Character mistake: When Michael goes to the antique shop, the sign out front is spelled wrong; it reads "anitques."
Continuity mistake: Throughout the film, John Travolta's hair changes back and forth and back and forth from being really really really short to just really short.
Continuity mistake: In the car after Martin tells Hans about the throat slitting story, Billy and him get into an argument about the violence of the story. Billy says "It's going to be violent, it's about seven fucking psychopaths!" Martin then says "Hey!" But you can see in the back seat his mouth doesn't move for that. Then it cuts to a close up of Martin and his head is in a different position, facing Billy where he was looking out the window a moment before. (00:58:05)
Continuity mistake: In the intro, the mother is playing with her kid; notice that when she grabs the gladiator puppet she is holding it with the index finger above the shoulder in the wider angle, below in the frontal close-up. (00:01:00)