The entire film was shot with a single camera.
The hotel in the film was an old out-of-business hotel near Carlsbad, New Mexico. It was actually burned down for the film. The ruins were later recorded as a historical archaeological site with the New Mexico Department of Historic Preservation.
Grayson Hall came up with the idea for her character to hold a drink in her hand in every scene in which she appears.
The scenes with the gargoyles running and moving were slowed down to give the gargoyles an unnatural jerky quality.
Bernie Casey's voice was replaced by Vic Perrin's voice in post-production because his natural speaking voice didn't fit the character of the head gargoyle.