Deliberate mistake: Within the final crash scene, in the shot where the flames are first shown exploding through the cabin, you can plainly see that all the seats (especially the aisle seats) are empty. In addition, this shot takes place after several shots depicting cabin breakage, and debris flying everywhere. Here, nothing is flying anywhere, and nothing is broken.
Continuity mistake: There is a whole sequence where the two main characters go to a mall. They are supposedly in the East Bay Area (Oakland, California). When they come out of the mall, there is a prominent sign for "The Broadway". That chain of stores does not exist in Northern California.