Other mistake: When Mutini first gets shot, the gunfire supposedly comes from inside the vehicle, but the windows and doors are closed, the glass doesn't shatter when the shots are fired. There are no visible bullet holes when the door is opened.
Suggested correction: He was shot through the door. There are two visible bullet holes in the door when the shots ring out and when the door opens. Just below the window.
Factual error: When giving her phone number to the ATF, Claire says 877-504-****, She meant to say 504-877-**** because 504 is the New Orleans area code. Even though 877 is a legitimate are code, it's used for free calls and why would Claire have an 877 area code at her residence? Considering the exchange was 504, she probably just jumbled the phone # that should've been 504-877-****. The same phone area code Agent Carlin leaves on Claire's answering machine.
Suggested correction: The number is an easter egg and if you look it up, it's a number reserved by ABC/Disney specifically for TV and films: 877-504-8423.
Plot hole: Just before the bomb explodes at the beginning of the movie, the guard is looking for the car playing 'don't worry baby' on it's stereo. In the final timeline the disaster has been averted, the bomb having gone off, and the ferry docked. After this, when Carlin is in the car, the same song is playing, but the bomb was set to a timer.
Suggested correction: That's why the movie is called Deja Vu and thats why Carlin gives the girl such a strange look. The song triggers a feeling of Deja Vu for him and it almost feels to him that he knows her. Besides, a different station could have been playing the song.
Suggested correction: The first time it plays comes off the radio. The second time we hear it mid-play. It could have come from a different station, the same station could have played it again later, or a CD or cassette being played in the car.