Neither Warner Brothers nor any of the other American majors wanted to deal with Carreras anymore, so the budgets were cut to $200,000 as the decline in Hammer films had begun with the loss of large-scale American distribution.
John Forbes-Robertson was considered for the role of Dracula before Christopher Lee was persuaded to return. Forbes-Robertson later played Dracula in The Legend of the 7 Golden Vampires (1974), the only Hammer film to feature an actor other than Lee in the role.
Simon finds Paul hanging from a wall with a hook stabbed through his back and out to his chest. In the close up, Paul's mouth is open with his top front teeth showing. In the next shot, his mouth is almost closed with no teeth showing at all.
When Klove is preparing to make a bed for Simon, and when he says 'The young lady will be quite comfortable', the shadow of a microphone is visible in the left upper corner of the screen.
The Priest: [to Simon and Sarah]
What we shall be facing in a few hours' time is not a man. He is evil. He is the embodiment of all that is evil. He is the very Devil himself.