This is the movie that the line "It's in the trees! It's coming!" was sampled from for the opening of Kate Bush song "The Hounds of Love".
This film was mentioned in the opening song from The Rocky Horror Picture Show (1975) ("Science Fiction Double Feature"): "Dana Andrews said prunes gave him the runes, but passing them used lots of skill".
In interviews regarding this film, Dana Andrews credits the story to Oliver Onions. The story is actually based on "Casting the Runes" by M.R. James.
Beginning in the 1980s, Columbia Pictures replaced their edited 83-minute U.S. version with the uncut original 95-minute version while retaining the U.S. title "Curse of the Demon." The various video releases, and pay-tv showings, have used this restored version. A DVD release contained both versions.
Jacques Tourneur originally planned to shoot the movie without directly showing the monster, but the studio pressured him to add it for commercial reasons towards the end of filming.
Joanna Harrington's license plate includes the numbers "666", the traditional "Mark of the Beast."