Other mistake: When Dandy goes on his shooting spree, the pistol he uses holds 9 rounds. When Jimmy returns to find everyone dead inside the main tent, there are 11 dead bodies laid out.
Camp Redwood - S9-E1
Other mistake: Most of the mud on Brooke should have been washed off as she walked through the downpour to enter the cabin with the others.
Camp Redwood - S9-E1
Other mistake: When the group enters the infirmary, none of them are soaked from the downpour of rain happening outside.
Visible crew/equipment: As the camera pans behind Kyle, the camera can be seen above his head in the mirror. (00:15:30)
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