Character mistake: The doctor states that the devil resides in the "frontal gyrus, the occipital lobes" and taps on the guy's forehead. The occipital lobe is at the back of the brain. (00:35:50)
Character mistake: When Lana and Kit are speaking in the cafe, the window behind them contains a spelling mistake. The window reads "Bolyston Cafe" when it should say "Boylston Cafe." (00:31:45)
Chosen answer: Because on Halloween, the souls of The Dead are said to roam the Earth. That includes those souls that are trapped within the walls of the "Murder House".
THGhost