Factual error: After the train crash, the teen characters discover cube-like items. One of them states it looks like a Rubik's Cube. The movie itself takes place in 1979, but the Rubik's Cube, although invented in 1974, was not licensed to sell in the USA until 1980. It was not even called a "Rubik's cube" until 1980 (prior to this, it was known as a "Magic Cube"). (00:21:55)spectrauru
Audio problem: This scene is repeated multiple times in the movie: usually when the main character enters the "source code" the scene begins by panning over a small pond showing a Canada goose taking flight. However the sound editor makes the mistake of dubbing in a recording of a hen mallard duck.flynn
Continuity mistake: After meeting Elise on the bus and getting his Blackberry dumped into his coffee David Norris calls his friend Charlie with his "spare phone" (silver). But after a cut or two you can see that he uses his BlackBerry again. So he has changed the phone during the conversation AND his coffee BlackBerry seems to be working again. (00:19:20 - 00:20:10)
Continuity mistake: When Tick Tock freezes Rebecca and Cecil, they are in one position, and when they go to the close up of them frozen, they are in a different position. When it zooms back out again they are in the first position. Also, when they are frozen moving on the conveyor belt, they are back in the position they were in on the close up shot. (00:47:50 - 00:48:10)
Continuity mistake: During the film, Daniel Craig's character rides out to the house where he last saw the woman he was in love with. During the wide shot showing him on his horse riding toward the camera, the device on his wrist is missing. It is obvious if you are paying attention, as he is using the arm which is supposed to have the device to hold the reins of the horse.
Plot hole: Towards the end of the movie, the characters use cell phones to determine whether or not the enemy is coming. However, throughout the whole movie, one of the girls has her cell phone, which never goes off even when the enemy is close.