Revealing mistake: After exercising, Valerie is in bed watching the news, then the scene changes to a shot of her house showing a Honda Accord at the 2002 meeting but this model did not get released until 2008.
Continuity mistake: When Stern is cutting Gutterman loose and they're at Rachel's desk, Gutterman is right behind Stern, close enough to touch the desk and sets his hat on it. The shot changes and Gutterman is now further away, not even in arm's reach of the desk.
Continuity mistake: During his second interview with Jack, Stone tilts his body to the right in the front shots, but remains straight in the back shots.
Audio problem: When Niko is going to get the key for somewhere for Zoe to hide and then Zoe disappears he says "Zoe"? When he says it his mouth does not move but once he finishes saying it that's when his mouth moves.
Continuity mistake: When the two young lads jump off the bridge to escape in handcuffs, as they fall together the handcuffs disappear. (01:12:00 - 01:13:00)
Factual error: At the conclusion of the film it is stated on screen: "Ayrton Senna died aged 34. In the aftermath of his death, the FIA appointed Ayrton's friend Prof. Sid Watkins to improve safety in Formula One. There has not been a fatality in Formula One since." While it is true that no driver has been killed at a Formula One Grand Prix since Senna, there were crashes at the Italian Grand Prix in 2000 and the Australian Grand Prix in 2001 which resulted in the deaths of marshals. (01:37:50)
Factual error: When Bill goes into the convenience store near the start, you can see Starbucks drinks in the cooler. This was supposed to be 1980. Starbucks didn't have bottled drinks introduced to convenience stores until 2006. (00:11:30)
Continuity mistake: When Charlotte Gainsborough has a meltdown telling the younger kid to remove the toy guitar, the kid is holding the toy differently between shots. (00:17:20)
Factual error: After warping back from Iscandar, Kodai looks out of the window. Yuki Mori points him where Earth is. A moment later, he responds to the hailing signal saying that they are now 420,000 kilometres from Earth. Considering that the distance between Earth and the Moon is about 385,000km, Earth is looking unreasonably minuscule from their window. (01:52:50)
Other mistake: In the bathroom scene where bullies were beating up Jarod, David Valentine "finished" by making the hardest direct blow to Jarod's left cheek near his eye. Afterwards, there was no visible injury to Jarod's left cheek; the injury was on Jarod's right cheek. (00:34:54)
Factual error: Sergeant-Major Saunders is wearing sergeant's stripes. Corporals Drake and Levin are wearing no rank insignia at all.
Character mistake: Two police officers went to the Davenport's house because someone "requested a drive-by in the middle of the night." The veteran cop rang the doorbell, knocked on the door, heard noise (dismissed as "probably a pet"), and even yelled, "Rise and shine, people." He told the rookie cop that he was "trying to go the extra mile to make sure these folks are okay" and "Somebody called in a drive-by and I want to see their smiling faces." The officers nonetheless left when they got another call. (00:19:19 - 00:20:41)
Continuity mistake: In the beginning, when Billy is talking to the bum (who later turns out to be Tawny), the bum has a glove on his right hand. When he reaches his right hand out to Billy and Billy gives him a subway token, there is no glove. It's back in the next shot.
Deliberate mistake: The (fake) confession letter was postmarked from Ohio and sent to Allison Connor, 331 Henry Lane in Hilliard, MB 21243. No U.S. state has a postal abbreviation of "MB." The way the "B" was written in thick bold letters made it resemble a "D" - "MD" represents Maryland (where the film apparently takes place). Also, there is no current 21243 zip code in the U.S. There is a 21241 for Baltimore City and the next consecutive zip code is 21244 in Baltimore County. The created address LOOKS real. (00:50:44)
Other mistake: The protagonist is still a kid, and she is telling in voiceover about all the things she vows to renounce hoping to have her dad back in health. On the porch she knocks repeatedly on the wood, but the magical numbers don't appear. (00:05:00)