The Soda Spring Spa was actually the Arroyo Del Valle Sanatorium, a treatment center for tuberculosis in Livermore, California which opened in 1918. With TB cases in decline, the sanatorium was closed in 1960 and sat vacant for more than a decade before the movie was filmed. The ruins were cleared in 1999, and Camp Arroyo was constructed on the site.
The plumbing at the movie's primary location was long out of service, so they had to bring in a port-o-potty. Dignified and aged stage actress Edna MacAfee emerged from the stall one day raving that it had a handy purse holder. No one on the crew had the nerve to tell her that she was putting her purse in the urinal.
When they recorded extras for the Code Red blu ray in 2017, stars Laurie Walters and Joe Spano could scarcely remember anything about the making of the movie. They had no idea how they became involved, when or where the film was shot, and Walters had completely forgotten that she'd played dual roles.
The movie was saddled with the title "Warlock Moon" by the original distributor, Enchanted Filmarts. There are no warlocks nor is there a single shot of the moon in the movie.
Stars Laurie Walters and Joe Spano were dating during the film's production, but several years later Spano ended up marrying Joan Zerrien, who appears alongside him in the film's opening scene. All three had met while taking classes at UC Berkeley.
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