Continuity mistake: When Martin goes to meet Jean, it shows him get out of the car as Will stays. The camera focuses on the rear view mirror, showing Martin walk up to Jean and stop as they begin talking. The very next shot from outside the car shows Martin walking again, and then Jean begin talking as if for the first time.
Factual error: When Ranger takes Stephanie to buy a gun, the one she gets is a 5-shooter, but in the scene where she is firing it at the gun range by herself she shoots it 12 times without reloading. Later, in the scene where she shoots Jimmy Alpha, she fires it 7 times without reloading.
Audio problem: When Emily picks up the tooth from the box, she says "ew" but if you look in the mirror her lips don't move.
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.
Other mistake: After the medical student leaves the unconscious co-pilot to one of the other passengers to watch while he goes to the bathroom, she notices his hands grow cold after a bit. It is only then they realise he has stopped breathing, and then get a defibrillator out and are successfully able to use it to revive him with CPR as well. However if he has stopped breathing for long enough that his hands have started to get cold, he would already be way too far gone to be able to be revived.
Other mistake: After the daughter visited with her mother for the first time, she is reviewing the footage with the priests. No such camera angles were taken for what they reviewed, only an overhead room camera would have been available.
Continuity mistake: After Mike has set the tent up they go for a ride on their snowmobile to check the scenery out. They come uphill parking the snowmobile facing upwards. They get up looking at the scenery, and a few shots later the snowmobile has suddenly turned 180 degrees facing downhill. (00:13:40)
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)
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: When Luke grabs a beer from the mini bar in the hotel, there's a lot of beer foam in the top of the bottle. In the next shot, when Luke's sitting on the bed, the foam is gone without taking a first sip.
Continuity mistake: When the dog comes in and takes Dale's hand the blonde woman's legs keep changing position. (00:47:00)
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: The Iowa is sailing with a depleted crew, one that most likely has no experienced gunner's mates. The 16-inch turret requires a 79-man crew to operate it, and can fire a salvo every 30 seconds. Despite these handicaps, the minimal crew in the movie was firing salvos every few seconds.
Continuity mistake: At the beginning of the film, Richard Gere, with the help of his grandchildren, blows out the candles on his birthday cake. 3 candles are still lit, then suddenly extinguished.
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)
Visible crew/equipment: When the mum is walking into the kitchen, as she places her bag on the counter you can see a camera man and camera reflected in the oven to her right. (00:15:10)
Continuity mistake: When the guy with the hat plays pool and goes to hit the blue ball, in the next shot it changes to white and he completely miscues. (00:27:25)
Character mistake: When Michael goes to the antique shop, the sign out front is spelled wrong; it reads "anitques."
Factual error: Close up, very detailed footage of a Cobra citizens band radio is used for the scenes where dispatch radio traffic is coming over the police radio. Police dispatch does not, nor has it ever, used the Citizen's Band radio service. (00:11:25)
Continuity mistake: When the mother breaks the window to enter the neighbor's house the next frame shows the glass still intact. (01:07:00)