The film was originally conceived as a low budget softcore pornography film with the title "The Loves of Count Iorga, Vampire". Later, however, the decision was made to film it as a regular horror film with the less erotic title "Count Yorga, Vampire" . This name change explains the poor animation of the name "Count Yorga" in the film's title as it now appears on screen. The original title (and original Iorga spelling) were restored to the film by the 1990s, but all prints of it were identical to the original 1970 release. Apparently, no additional footage survives from its original erotic version (it is worth noting, however, that the characters often pronounce the Count's name within the film as "Iorga" (ee-yor-ga) and not as "Yorga" (yor-ga)).
American International Pictures had planned to revive Count Yorga as an adversary for Dr. Phibes in the film Dr. Phibes Rises Again (1972). While this plan was eventually scrapped, actor Robert Quarry (who played Count Yorga) did appear in the film as Darius Biederbeck. He also went on to costar with Vincent Price and Peter Cushing in the horror film "Madhouse" (1974).
The scene in the film where Erica is discovered eating her pet cat was accomplished by covering a sedated kitten with canned lasagna.
Legendary actor George Macready narrated this movie, his son Michael co-starred, and it also features blonde bombshell Erica Macready as the doctor's Swedish nurse, who in real life was married to Michael (listed as Erica E Ebeling on his profile), making her George Macready's daughter-in-law.