When George and Robin have their "romp" in the garage the clock on the wall reads 2:30. Afterwards, Sam goes outside and hugs several people then we cut to Robin still in the garage and the time on the clock is 2:20.
In the beginning of the movie when Mr. Dokos is chasing Guster with his car, in one shot it is a big SUV and in the next shot from the side it changes to the black Lexus that we know is his car later in the film.
When Sam is on the roof and talking to Josh, whom Alyssa has volunteered to help, we see a partially digitally erased plane fly out from behind his right ear. A few seconds later, when we cut back to Sam the same ghost of a plane is visible to the right of his head and flying right to left.