The scene where they first try to play the record took a while to film as they struggled with how to create the effect of the needle jumping across the LP. As the effects guys worked on a line of filament another crew member suggested simply removing the needle from the arm.
One of the real life judges of the Salem witch trials was named John Hathorne, pronounced Hawthorne. His descendant, the famous historical novelist Nathaniel Hawthorne, changed his name to be spelled like it sounds.
Rob Zombie wrote himself a novelization of the film along with writer Brian Evenson. According to Zombie, the novelization is based on his original screenplay, which differs significantly from the final script used in the film.
The screenplay had a subplot about a film named "Frankenstein and the Witchhunter", a kind of Hammer films exploitation that the characters of Matthias and his wife attend thanks to free tickets from the radio station. Rob Zombie shot this "film-within-the-film" with Udo Kier, Camille Keaton and Clint Howard. But all the scenes related were deleted from the final cut.