Filmed at the historical Woodbury-Story House in Altadena, CA.
The works of H.P. Lovecraft are directly referenced or alluded to through the film: Necronomicon, New England house, idol of Cthulhu, Miskatonic University, characters with last names Derleth (August Derleth) and Armitage (Henry Armitage), nearby town of Dunwich, Arkham.