Audio problem: The chef finally gets the bright idea to fire his hunting rifle at Morgan's fleeing vehicle. In a previous scene he was grabbing ammunition for his rifle, and he also loaded it. The rounds appeared to be high power rifle ammo, probably in the 7mm Remington magnum or .30-06 range, very common hunting rounds. When he fires his rifle it sounds quieter than a suppressed shot, however he has no suppressor on the muzzle end of his weapon. (01:09:20)
Continuity mistake: When Sook-Hee first goes to the library, she slides the door open. Once she finishes sliding the door open, she still has her left hand on the door frame. It cuts to an angle from behind where her hand is now off the door frame and being pulled away. (00:21:20)
Revealing mistake: When the Creature is telling Louis the "Bat Story," the Creature is holding a burning torch in its right hand against a wholly-dark background. It becomes apparent that the shots of the creature are actually Dutch Angle shots (the angle of the camera is rotated about 45°), because the smoke from the torch is not rising straight upwards; rather, the smoke is rising at a 45° angle toward the upper left corner of the screen.
Continuity mistake: The protagonist (Andrea Bowen) is in the car with the captain, who is debriefing her about the subjects involved in the case. Throughout the conversation, multiple times her hair covers her ears or is combed behind them, with no consistency. (00:11:20)
Continuity mistake: The cursed necklace is shown emitting its evil fumes on the white paper of the letter, but the letter itself is perfectly 90° with the envelope, or at a different angle. (00:06:20)
Other mistake: The typewriter ribbon in Gemma Arterton's typewriter looks to be installed upside down, with the red half of the ribbon showing above the black half.
Factual error: Joe Biden is right-handed; in the movie, Greg Kinnear signs with his left hand.
Continuity mistake: Carolyn puts on her pink dress and asks Tallulah to zip her up. Tammy Blanchard puts her hair up in a bunch, but there's a large bang to the left side of her face that stays down. In the reverse shot though, she got all her hair up. (00:18:20)
Continuity mistake: The blood that drips on the girls disappears between shots. (01:06:00 - 01:07:00)
Revealing mistake: When Gabby and Fin are hanging off the building in Las Vegas, you can see that Gabby isn't holding on to anything in some close-up shots. (00:11:47)
Other mistake: When Warwick Davis shows Joe the form he's tricked his father into signing to allow him to transfer schools, the form is shown full screen. The "home" phone number is the same as that used in the school's letterhead, and there is text that says"insert name of fictitious school here." Also in this scene the name of the headmaster and phone number is visible, but none of those details match what is on the school's advertising board a couple of scenes later when Joe starts at his new school.
Deliberate mistake: The movie is set in the late 50s, but Howard Hughes is dealing with his plane crash and the senate hearing about the H-4 Hercules prototype. Those are events from over a decade earlier. However, it should be noted that the initial disclaimer of the movie is "Names and dates have been changed."
Continuity mistake: In front of the station, the con man bargains with the taxi driver the fare; during the scene, the same black man with a floral shirt passes at least 3 times. (00:01:30)
Continuity mistake: Maudie lights herself a cigarette. There are 2 matchboxes on the railing of the porch. They disappear for the rest of the scene and Maudie's cardigan and dress do not have pockets. (00:02:35)
Continuity mistake: When Justin Bieber takes out his phone after being shot, the time on the phone is displayed as 1:48AM, but seconds later, when the camera pans down on the phone before the scene ends, the time displayed on the phone is now 1:51AM. Three minutes did not pass during this time.
Visible crew/equipment: A cameraman is in the bush at the start between the preacher and his mule. (00:01:06)
Continuity mistake: John Biswas is tailing the little deaf girl. His scooter breaks down and he follows her on foot. They are walking in the same road in two different shots, with a cut just a few meters apart. The toys in her right hand and the paper in her left swap hands in the second shot. (00:18:20)
Continuity mistake: Near the end of the film when Robert De Niro gets to make out with the college girl, the switches between camera shots show his shirt off and subsequently back on again.
Continuity mistake: Throughout the movie, fire axes seem to be the weapons of choice. Only two fire axes are used, but they appear recurrently. In the very first use, the protagonists grab fire axes to butcher the monster called Beverly. Blood and gore go everywhere; yet, the axes emerge from this bloodbath with no blood or gore on the handles - they're virtually pristine moments later. The axes are used again and again, right up to the ending, and blood comes and goes from the axe handles seemingly at random.
Continuity mistake: When they are at Sarah's house, the boy's father tells her to go outside and ask Lucas to pull the van around back. When Sarah walks to talk to Lucas her long braided hair is tucked into her shirt and her arms are crossed. In the next shot when the camera comes back, her hair is on the outside of her shirt despite her arms still being crossed. (00:45:55)