The film that Count Yorga watches on television is Hammer Films' The Vampire Lovers (1970). A "foreign" language soundtrack was added to this English-language film for this very purpose.
The final film of veteran George Macready. NOTE: Michael Macready, his son, produced both "Count Yorga" films.
Count Yorga's mansion in the film is Casa Dorinda in Santa Barbara, CA, which is now a retirement community.
The film's on-screen title was "Yorga Returns" when CBS released it to television on the series "Friday Late Night Movie" in the 1970s.