Edward Mordrake: Part 1 - S4-E3
Factual error: Season 4 takes place in 1952. Elsa sings Lana Del Rey's Gods and Monsters. The lyrics say "living like Jim Morrison." Jim Morrison was not famous until 1960. He was born in 1943, which would have made him only 9 at this time.
Factual error: All the survivors save Ms Venables and Mead die from eating apples injected with snake venom. The show is confusing venom with poison. Venom must be injected into the bloodstream to be dangerous. Eating venom is harmless to humans. Unless all of the survivors had stomach ulcers, none of them should have shown any ill effects, nor should they have died.
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)
Edward Mordrake: Part 1 - S4-E3
Factual error: During the Bette and Dot surgery dream, we see the bone saw machine brought in and it says "Easymatic 300." In actuality, the machine is the power source for an X-Ray machine and wasn't produced until the early 1980s, while the season takes place in the early 1950s.
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