This movie's US release under the title of "Horror Hotel" omitted the following lines during Elizabeth Selwyn's burning at the stake in the first scene, which are critical to fully understanding the plot, but apparently offended American censors: Elizabeth Selwyn: "I have made my pact with thee O Lucifer! Hear me, hear me! I will do thy bidding for all eternity. For all eternity shall I practice the ritual of Black Mass. For all eternity shall I sacrifice unto thee. I give thee my soul, take me into thy service." Jethro Keane: "O Lucifer, listen to thy servant, grant her this pact for all eternity and I with her, and if we fail thee but once, you may do with our souls what you will." Elizabeth Selwyn: "Make this city an example of thy vengeance. Curse it, curse it for all eternity! Let me be the instrument of thy curse. Hear me O Lucifer, hear me!"
Originally written as the pilot for a horror television series intended to star Boris Karloff that never got made.
Released in Britain in September 1960, but not released in the US until September 1962 when it opened in Los Angeles as "Horror Hotel".
Scenes from this movie were used in the music video for Iron Maiden's "Bring Your Daughter To The Slaughter", in 1990.
This was the first movie made by Amicus Productions, one of Hammer's most successful rivals in the 1960s and 1970s. At the time of this movie, however, the company was known as Vulcan Productions.