Continuity mistake: Doctor Leo sits at the desk and begins writing a letter to Alec Ritchfield. "My dear Alec", it starts. Fade to the finished letter, but you can easily tell that it's not the same letter, the handwriting being different - look at the little flourish below the M, not to mention the position of the text in relation with the Fog Island stamp. (00:08:25)
Continuity mistake: The policeman drives up to the house and parks his motorcycle facing the front door. He goes to the door to talk and then returns to his motorcycle and prepares to leave. When he gets back to the motorcycle, it is now parked facing away from the door. (00:08:05)