Audio problem: Obviously, the mouth movements won't match the English voice-overs, but when Yang Hao is singing "Happy Birthday" to his daughter Yuan Yuan, his mouth doesn't move at all. (00:05:50)
Character mistake: The interviewer pointed out that Evan [Mark Wahlberg] is a "smart guy" and another man later said, "Homeboy knows everything. He's a freak." When Evan was telling the interviewer the circumstances under which he assaulted a man, Evan committed a basic grammatical error - a misplaced modifier: "I asked him to leave politely." Evan didn't mean he wanted the man to leave in a "polite manner"; he meant he "politely asked" the man to leave. (00:09:20 - 00:14:00)
Continuity mistake: The way Franck's scarf was wrapped and tied around his neck changed from when he was sitting on the steps (wrapped around a few times with ends folded under) to when he was standing along the guard rail (a loop down the middle of his chest). (00:15:09)
Continuity mistake: A back view of the group of four-wheelers starting out driving through the field showed distinct tire tracks in mostly low, dry brown grass. Various other views showed little or no discernible tire tracks, tall lush green grass, and mixed dry brown and green grass. Even though the four-wheelers appeared to travel some distance, the end of the field that was visible from the onset was just reached. (00:21:35)
Deliberate mistake: The view looking out the windshield showed the man on the bicycle had stopped when he was in front of the car's passenger side, but the outside view showed the man still coming to a stop and then tilting his bicycle. (00:07:12)
Continuity mistake: Alexander still had the mark/cut on his forehead, running vertically to the outer edge of his right eyebrow, when he found the "Mars" candy bar, but it was gone less than 30 seconds later (after he found the gun). The angle as well as its appearance (wider, longer, straighter, and more pronounced) of the mark/cut on his right cheek also changed. (00:02:20 - 00:03:26)
Other mistake: Liam Neeson jumps into ice water to rescue his brother. He then painfully pulls his brother into the cab of the truck. Inside, he revives his brother after which they have a lengthy conversation. Liam's Mike McCann never starts the truck engine or turns the heater up, even though he and his brother are soaked to the skin and the brother is coughing up ice water from his lungs. In the next scene, both appear dry, in the same clothing, with no signs of hypothermia.
Continuity mistake: Rudy looks at the candy cane, which is broken off at the handle/arc. Rudy sucks on the candy cane while he talks to his mum on the phone. When Rudy removes the candy cane from his mouth, the curved part is longer than when he first puts it in his mouth. (00:08:40)
Revealing mistake: The "bridge" within the crime scene tape is obviously a prop. It should be a continuation of the road, but it is tilted to the left and is more vertical (around 45°). The bridge isn't even very high. When Byron and others go under the bridge to look at the dead girl, there is only a few feet above their heads (clearance under the bridge). (00:04:54)
Other mistake: The issued sidearm for the Spanish National Police is the H&K USP 9mm Compact, which has a capacity of 13+1 bullets, and the Civil Guards' is the Beretta 92fs/M9, which is a 9mm and has a magazine capacity of 15+1 bullets. As of 2020 the Beretta is being phased out for the H&K USP C. The police officer fires a total of 5 bullets from his Beretta then the slide locks back because its dry. He has no magazines for reloads either. I highly doubt the Spanish police issues 5 bullets to their officers. (00:33:00 - 00:35:30)
Continuity mistake: After talking with Bullock on the roof, Batman is in his vehicle and talking to Hugo. On the screen, Hugo lifts up a glass to his mouth to take a drink, but when the camera cuts to a close up of the screen, suddenly his arm is lower, and he is once again lifting the glass to his face. (00:05:37)
Factual error: Morse code is supposedly being transmitted by the blinking street lights. They supposedly spell "For 3veryth5h1ng that 7iv3s is holy." I know Morse code. It was just a random scattering of letters. (01:00:05)
Factual error: He grabs a Glock handgun and a suppressor and begins threading on the suppressor. For this to work in real life, the handgun would need a threaded barrel which extends half inch past the end of the slide. The one he grabs, the barrel is flush with the slide, no threads. (01:05:35)
Revealing mistake: During one of the chase scenes, an SUV hits a rock barrier and flips over landing on its top. The car spins around, and we see that it is empty. The driver then climbs out as if he was just in the vehicle.
Other mistake: While Snake Eyes is fighting at the beginning of the film, the other guy throws him to a block of concrete. Snake hits on his head and should be dead by then or at least seriously injured.
Deliberate mistake: When James started to fall off the ladder, he tried to jump to reach the other side. Thom grabbed his right hand with his and was able to pull him to safety. James' weight and the force with which he jumped and swayed would have most likely resulted in James pulling Thom over the edge with him, and both being seriously injured or killed. (01:22:26)
Continuity mistake: When the terrorists take over the plane we see Eightball brutally stab a secret agent to death, and he gets blood on his face and clothing. In many scenes after this the position and amount of blood can be seen changing.
Continuity mistake: In the initial view of Billy in the tree ("saved for later" by the leopard sleeping on another branch), his head is hanging face up alongside a tree branch as wide as his head. When the camera zooms in showing the middle of Billy's face, the left side of the screen should be all brown, representing the branch. Instead, there is blue sky down to his eye and blurred tan/brown representing the branch. The brown might supposed to be the dried grass, but Billy has not moved his head. (00:51:25)
Continuity mistake: At the beginning of the movie, the real estate agent greets the McKenzies, lovers of all things open. The potential clients hold the papers in a completely different way at the cut ("I was just telling the Breckins that..." etc). (00:01:15)
Continuity mistake: The white gift box was placed on the car's hood near the passenger side front wheel indentation. When the female cop (Valerie) turned around, the box was at an angle, not parallel, to the indentation. (00:02:21)