Factual error: Cell phone signals are repeatedly blocked by electromagnetic radiation from the sun. However, GPS devices, which receive a much fainter signal from satellites, continue to operate. For that matter, television broadcasting, which relies on satellite relays, continues until the end of the film.
Suggested correction: Only local TV news - from a local news studio - is shown near the end of the movie. Local TV stations don't require satellites for operation, only for receiving live reports from distant locations.
Continuity mistake: Early in the film, Nicholas Cage is hitting the bottle. After pouring one or two drinks, he starts to pour another, nearly fills his glass, then spills it. Although the bottle is about half-empty at this point, the next time it is shown standing on a table, there is only a small amount remaining at the bottom.
Suggested correction: There's no indication how much drink is in the bottle after he spills it. There's the correct amount of drink in every point of the scene.
Revealing mistake: In the scene where John first discovers the patterns of numbers, he writes all of the numbers on his whiteboard. He circles the numbers he finds online with a colored marker. When he circles the number 2708 with the blue marker, he passes over the 8 with the marker, but the original black 8 and part of the 0 appears on top of the blue, showing that it was done using some overlay technique. This same effect is shown several times including when the blue and red pens mix but are still behind the black. (00:24:55)
Suggested correction: Black marker is never on the top of the blue, blue marker is simply transparent, so you can see black marker through it.
Continuity mistake: In the scene where there is heavy traffic on the road (before the plane crash), John gets out of his car to see what's going on. As he's making his way to the front, he passes a black pick-up truck. The camera angle changes, and you can see John pass the same truck again.
Suggested correction: He never passes a black pick-up truck, the only minor flaw is he is shown a little further in the next shot from that truck, than he was in the previous shot.
