Dave receives a text message to his iPhone from Aubrey. His phone is on the passenger seat lit up showing the time as 1:57. Seconds later he picks up the phone to read the text and it shows the time as 11:15.
In the final scene where Aubrey decides to run back to Dave, who is still at his car, you see her drop her bag to the ground to make out with him. In the next scene however, they change the camera angle of them making out, and the book-bag is nowhere to be seen.