Plot hole: When Rupert brought his "secret pen pal" letters from Hollywood movie star John to school, they were stolen by some classmate bullies (and apparently never recovered). Rupert would have been around age 11 (possibly 12) at the time. It is inconceivable that a child could recall enough details from the letters to write a book about them 10 years later.
Factual error: The police officer that shows up does two stupid things in a row that real police would never do. When investigating a kidnapping, he calls in what the car was they were looking for. Which he sees. Instead of calling for back up, or even mentioning to dispatch that he found a car that looks like it, after coming from a murder scene at a gas station and following a map left behind to this spot, he approaches the car alone, without calling for back up, or drawing his weapon. Shortly thereafter, he finds the kidnapped boy inside the car, who tells him the man who took him is in the house. The officer then proceeds to go into the house alone to look for a dangerous kidnapper without waiting for backup, even mentioning to the kid that his partner is on the way. (00:32:00 - 00:33:35)
Continuity mistake: After Omar Sy beats up the masked pickpocketer in the Chinese supermarket, he waves the crowd to move on. The stick he has switches hands between shots. (00:04:25)
Continuity mistake: Ron Perlman and Famke Janssen are having dinner on his supposed birthday. The whole meal has several continuity errors, with her fork being at different heights, sometimes replaced by the wine glass, etc. (00:34:30)
Other mistake: The SUV hits a snow embankment. Immediately afterwards, there are no tyre tracks in the snow behind the SUV. (00:31:35)
Continuity mistake: Some figurines on Lidya's nightstand changed positions near the start. The rabbit was moved closer to the front, then back. The blue object was moved back a couple inches. (00:03:15 - 00:03:58)
Factual error: Michael boards a commuter train at Grand Central, which then stops at subway stations at 68th Street, 86th Street, and 110th Street along Lexington Avenue. This is impossible.
Continuity mistake: Felix on his skate jumps over a rolled-up rug some movers are carrying in the middle of the street. He jumps and the street is in the shade, he skates away and the street is full of sunshine. (00:01:30)
Continuity mistake: On his way to work, Antonio meets his ex Camilla.During their conversation, as it's particularly evident in the subway stairs sequence, passersby vanish every time the camera cuts to another angle. (00:08:00)
Continuity mistake: There are several variations or inconsistencies in Marcus' hair and tie from the time he goes through the metal detector and sits in the courtroom. His hair was consistently "messy", but disheveled right and/or left sides were inconsistent. The tie was fairly snug against his collar at first, but got looser then tighter. (00:54:14 - 00:57:08)
Continuity mistake: In the bar scene when Renee sneaks up behind Vivian, she puts her right hand over Vivian's mouth, then has her left hand on top of her right hand while covering Vivian's mouth; and then a moment later in a new camera angle, her right hand is over her left hand. (00:27:00)
Continuity mistake: When Phil heads to the Puppet Pleasure place early in the film, the positions of the shadows change around the vehicle parked out front in the close up, revealing the time laps between filming each shot. (00:06:30)
Revealing mistake: When the doctor with the satellite phone runs to the car, he is being chased by another member of the team, and of course the graboid. Look ahead of the graboid. The path it will take is visible.
Visible crew/equipment: During the opening while Ray and Maggie are driving at night, you can see the lighting equipment for the green screen reflected in Ray's glasses. And throughout the entire movie, these green screens and other production lights can be seen reflected in his glasses in several different scenes. (00:04:00)
Continuity mistake: The clothes Tyler and Kassi were wearing at Kassi's house were not the same when Kassi came to dinner that day at the Burnside's house. It seems unlikely that BOTH would change clothes before dinner. (00:31:49 - 00:32:40)
Suggested correction: Apparently they did. It was probably Tyler's idea, presenting Kassi in the best possible light to assuage suspicion and maintain his image as a good Christian Boy Scout.
Continuity mistake: In the opening scene with the skype call, Mia's hair is in front/behind her shoulders depending on the camera angle, with no logic. (00:00:55)
Continuity mistake: In the vault scene arguing/fighting with Gunnar, Taj/Lars had a clump of hair sticking up in the middle of the top of his head during most front views, but not rear views. (01:03:10 - 01:04:11)
Continuity mistake: The police shoots one of the kids who were robbing the Nurse. The body is lying on the sidewalk when she says "No, no, I can..." to them holding her at gunpoint, but when Batista kicks the cops around, the body shifted further to the middle of the road - where it should have been to begin with. (00:32:50)
Continuity mistake: Right at the start after they dock with the escape pod, three people enter and Kanelo calls out for Franklin. The guy behind Kanelo shines his flashlight to the right of the screen, but when it cuts to a close up of him, suddenly he's shining it towards the left of the screen. (00:03:15)
Continuity mistake: When Rick and Kirsten are at the game, just after they shout at one of the players, Kirsten drinks from her cup, but in the next shot, the cup is suddenly back in the armrest holster. (00:33:40)