Factual error: The same 1990-1991 Buick Lesabre seen in a previous episode appears in the background of the scene. The season is set in 1981, roughly a decade before this car would've been in production. (00:11:01)
Bad Fortune - S11-E5
Factual error: This episode includes a 1990-1991 Buick Lesabre as a background vehicle, while the season is set in 1981. (00:02:10)
Revealing mistake: After Hannah draws vials from the suspected bespeckled killer, he rushes through the hospital ward with no visible markings or needle pricks on his arm.
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