Continuity mistake: Nicholas Cage is stapling the posters with his missing child (strangely enough, all the concert posters are in terrible condition even if they advertise events that happen exactly when the movie takes place). He hears his son's voice and turns around, the wind flips the poster on his hand. When he turns back to it, the poster is gone (but he still has one to attach). (00:27:00)
Continuity mistake: Nicholas Cage sees his ghostly son through the window of a bus, and so he rushes after him. Right at the first left turn, the natural light couldn't be any more different in the two separate shots. (00:32:30)