It could be a Frankenstein film, an unreleased take from another castle clip, such as from "the Haunted Palace" or "the Terror", a short or a drive-in miniature advertisement for a non-U.S. film, a rare film, or a gag shot from a film also featuring a different castle clip. It is not from any of the films referred here that are featured in the main title footage. Perhaps Sinister Cinema or Wade Williams Inc know, since they are acknowledged for the main title footage in the ending credits of the film.
