Factual error: In the final scene where the gas grill blows up, the arm that falls to the table in front of the mother is not from a teenager - it is nearly twice as large as the young man's arms (as previously seen in multiple scenes). Some people say it's a leg, but if that's so it's a bit odd having fingers on the right side of it...
Revealing mistake: When the officer is looking at the pictures of the Flight 180 survivors and their deaths afterward, notice that Todd is shown still struggling at the ropes and looking into the camera. Apparently the media thought it would be better to take a picture of Todd as he was committing "suicide". A similar incident occurs with the bus accident picture. The girl is obviously splattered in the first movie, but appears to have mostly leg damage in the pics.
Continuity mistake: When Evan comes into the flat and walks towards the window, pay attention to the sink, there is a red cup or something in it. However when his arm gets stuck in it, there is nothing red in the sink, and there was no time for him to take anything out of the sink.
Add timeRonnie Bischof
Continuity mistake: In the beginning pileup, when the red SUV starts to flip, the front passenger wheel and suspension are ripped off and go off toward the front of the car. Yet, in the next shot, the car has all four wheels. After it shows the Trans Am going in the ditch, it shows the same shot of the wheel coming off from a different angle.
Visible crew/equipment: When the remaining characters are driving away following the van collision incident, Kimberly is seen to be having a second premonition involving the lake. As she is choking she lets go of the steering wheel, causing the car to swerve violently. In the shot where we see the car front-on, it looks like the cop character was actually a stunt driver in complete control of the van.