Character mistake: The blackboard in the opening school sequence shows the phrase "The quick brown fox, jumped over the lazy dog" this is incorrect. It should read, "The quick brown fox jumps over the lazy dog." The point of the sentence is that it contains all of the letters of the alphabet, but in the first example, there is no 's'. (00:03:07)
Factual error: The 9/11 death toll of 2996 - which John Koestler notices on the sheet of numbers - is the overall total for that day's attacks. But it is next to New York's co-ordinates, and the other attack sites have their own entries with locations and death tolls.
Other mistake: He says his wife died in a hotel fire at 4 am, and then says he was blowing leaves when she died. Who blows leaves at 4 in the morning?
Suggested correction: His wife died at 4 am in Phoenix, Arizona, while he was in Boston, Massachusetts.
Continuity mistake: When Nicolas Cage runs outside and yells at the elusive intruder, he hits the tree with his baseball bat, breaking in half. But a second later, after picking up his dropped flashlight, his bat is whole and unbroken.
Factual error: The aircraft that crashes in the movie is an Airbus A320-200, but however the wing strobe lights (white blinking lights on the end of the wings) are flashing in single phase (only flashing once a second), Airbus aircraft flash twice every second, only Boeing flicker once.
Factual error: The envelopes and letters from the time capsule are in pristine condition after 50 years underground. Even the papers are crisp and unfaded.
