In the scene where Dracula is being "resurrected" from a coffin into which his ashes have been spread, from blood dripping down from a poor victim (provided by Klove) Dracula is made to "manifest himself" over a period of about a minute. This was achieved by overlapping "dissolves" of a series of twelve locked-down camera shots, involving first the ashes, then a skeleton, then some body-fat on the skeleton, et cetera, along with swirling mist, until we finally perceive the full form of Dracula. He doesn't appear fully dressed as is usually the case. The shot moves to outside the coffin and a bare arm reaches out. The vampire's clothes were seen in earlier scenes awaiting his return.
Sir Christopher Lee said he found the lines given to his character so awful that he chose to play it silently. According to screenwriter Jimmy Sangster, Lee is mis-remembering this, as Sangster claims he wrote no dialogue for Dracula in the movie.
Filmed back-to-back with Rasputin: The Mad Monk (1966), using many of the same cast members and sets.
In the scene where the vampire woman is being killed by the monks, the shot of the stake being driven into her heart is systematically shortened by a visible rough cut. To this day, no copy with the complete shot has been available.
Sir Christopher Lee's stunt double Eddie Powell became trapped underwater during the drowning scene and nearly drowned.