Continuity mistake: When Nick and Annie are lying together in the hospital bed the camera switches between them a few times, every time Annie's head is either closer to Nick's than it was in the last shot or farther away than in the last shot.
Continuity mistake: When the police find Nick, his body is half submerged in the water. When the cop points him out, he's on top of the rocks, not covered by any water at all.
Continuity mistake: At the end of the film, Victor tells Nick to write 'hey Annie' on plane's wing to send her a message. When Nick throws the plane and the camera shows it flying around, the words that Nick wrote are nowhere to be seen.
Other mistake: About a third of the way into the film when Nick leaves school and is running home he gets hit by a car and run over by a truck. Before both events the vehicles horns can be heard, as if the drivers are warning Nick to get out of the road. If Nick was invisible there would be no reason for them to honk their horns at all.
Audio problem: Justin Chatwin's character wants to kill himself. He grabs a breakaway double-barrel shotgun off the gun rack and steps around the corner. Then we hear a round chambered in a pump shotgun. (00:43:40)
Continuity mistake: In one scene, Annie is in Nick's bedroom, looking through his mementos, when she gets surprised by Nick's mother. She immediately jumps up, grabs a pack from the floor at the foot of the bed (grey or light green), and runs out of the house. In the very next scene, she and Nick are running down a wooded hill...but the pack is nowhere in sight.
