Revealing mistake: It was pouring when Adam, Hannah, and Megan got out of their SUV to talk to the Man and try to get help with the flat tire. As they stood there, no "rain" was hitting them and it became obvious that their partially wet-looking clothes were "pre-wet" - they returned to the SUV with the same amount of "wetness." Also, the rain was coming down in straight streams, all parallel. (The water flow appeared to be slightly angled to make the artificial "rain" look more natural).
Continuity mistake: When the group go to the DARPA HQ during the post credits scene, pay attention to the doors as they enter the lab - the doors we see on the outside do not match the doors we see on the inside, revealing the scene was shot on two separate sets. (Most noticeably, the windows on the doors get significantly narrower once they are inside the lab).
Factual error: Attorney Aegis inappropriately rounded up/down a couple common statistics pertaining to the infamous Ford Pinto case, which resulted in a total that didn't add up: "it would cost the company $11 per Pinto to fix the problem. But with 12 million [should be 12.5] of 'em on the road, that would cost $137 million compared with $50 million [should be 49.5] to maintain the status quo. $137 million to fix a $50 million problem..." But 12 million x $11 = $132 million [not $137 million]. (00:24:38)
Continuity mistake: Katie has been grounded, and like most teenagers decides to just drink up a lot of booze. She's sitting on the bedroom floor with her bestie and passes her the bottle of vodka: her friend takes it with her left hand and drinks, but in the following shot she's finishing the gulp by holding it in her right hand instead.
Continuity mistake: His pickup truck windows are down during the car chase but once the pickup submerges in water the windows are miraculously up, giving him a chance to escape. (01:21:30 - 01:29:00)
Continuity mistake: Ray is speeding on the road that he previously traveled very cautiously. He is engaged in a tricky overtaking of 4 vehicles in a row. In the side view close-up he is overtaking the sedan, but after the close-up on the speed meter that is going past 80, he has yet to pass that same car, since the car before that was a SUV. (00:14:30)
Other mistake: Moose was narrating what he was writing in his second letter to Mr. Dunbar. There were 64 words, 12 more words after "P.S.", then "Love, Moose." A view of his finished letter showed it was way too short to have included everything he supposedly wrote, and the expected format did not match. (00:26:20 - 00:27:10)
Continuity mistake: At the start of the film, a man is giving a tour of a building under reconstruction to some potential buyers. One shot, as he's telling them that this sits on a 14-acre lot, there are just 3 people as they walk through a doorway. The film jump cuts to a closer angle, and suddenly a 4th person appears in front of them from thin air. (00:02:34)
Factual error: The film states that the story takes place in the year 1998. Everything in the opening scenes crams in every 90's cliché imaginable to reinforce the era. However, at 1m56s into the movie, the main character is driving on the freeway and it cuts to a shot showing that he's driving behind a marked police car. Specifically, a Police Interceptor model Ford Explorer that did not hit the market until 2012. (00:01:56)
Continuity mistake: Walter pushes his wife against the bedpost. They have their verbal sparring, and then he caresses her. Her hair is spread differently, more abundantly, in front of her right shoulder. (00:14:35)
Audio problem: The FBI agent is in pursuit of a suspect in a hospital, once he enters the stairwell he draws his Glock handgun, and a click can be heard for a safety disengaging. Glocks are striker fired, they contain no external safeties that can be manipulated that would cause a sound. A sound can also be heard after the gun is already drawn from the holster, representing a holster draw sound. (00:22:22)
Revealing mistake: Although the background scenery in the basement (behind the judge and Ron) changes with camera views, what is shown rarely (if ever) corresponds to the correct size and angle/location that would be expected. For example, the file cabinet in the corner behind Judge Straight shows up in different places, some very close to him and others at a distance; its size is not proportionate. Sometimes, the brick wall is directly behind the judge but to the right (of the screen) at other times. (00:03:28 - 00:11:29)
Revealing mistake: When Anita goes to destroy their getaway car you see her pour gasoline all over the roof and hood. Then when she lights it on fire it's only burning inside the car. (01:06:40)
Revealing mistake: The way the outside steps were constructed - a series of perpendicular boards with no side support - would not be able to hold weight. They would easily collapse under pressure. (00:38:53)
Other mistake: Daniel realises that Adereth gave him his own passport. When he looks at it, notice the machine code line; it's the passport of someone born on April 30, 1963, far off from Daniel's age, and more importantly, not matching the ID's date. October 10th 1982. (00:20:30)
Continuity mistake: When Alicia puts flowers on her mother's tomb, she casts a shadow on the gravestone in side view, but none with the camera behind her back. (00:03:05)
Visible crew/equipment: As the camera moves forward in the opening shot, a clear reflection of a film light can be seen on the side of the fire engine.
Other mistake: Glen/Charlie poured gasoline all over the vehicle he killed Sandra in - including its soft convertible top - but the flames stayed around the car's perimeter. (00:50:54 - 00:51:26)
Continuity mistake: For a second time in the movie, someone buzzes June on the intercom. She tries to overcome her fears and get out of the apartment, but can't. She shuts the door, leans with the left hand on the doorframe by the chain, and lowers her arm. In the next shot, Naomi Watts is breathing deeply still with her hand by the chain. (00:06:05)
Continuity mistake: The amount of blood on 10-year-old Miguel's face and neck after his "jump in" is not consistent. Sometimes there is more (or less) blood on his cheeks and neck and sometimes it appears splattered compared to large areas diluted with blood. The intensity/color of the blood also changes - sometimes it is very red but other times it is paler. The cut on his left eyebrow apparently was not on the far left corner yet sometimes the blood started there; other times, the blood started almost to the middle of his eyebrow. Sometimes he has blood below his eyebrow. Despite all the blood on his face and neck (down to the sagging T-shirt), there is no blood on his white or light grey T-shirt. He also does not get any blood on his jacket. Miguel was repeatedly punched then kicked by several large, muscular adult gang members for 13 seconds (to become a member of the MS-13 gang) but is unrealistically able to get right up then go and pick up and carry his dog - with no limping or signs of pain. (00:29:15)