Continuity mistake: When Erica eats the cat the telephone is on its side, then the right way up.
Continuity mistake: The footage of Dracula impaled on a giant golden crucifix at the end of 'Dracula Has Risen From The Grave' is re-cut for the pre-credit sequence of this film. However, when the second film continues, the golden crucifix is missing in the background, behind Dracula's powdered blood and collapsing cloak, creating a continuity error with perhaps an unusual reason for happening. Hammer props department may have rid themselves of the crucifix between films shot a year apart.
Continuity mistake: Paul enters the castle in Dracula's coach. When he gets out of the coach and walks around a bit, the coach with the horses has suddenly disappeared.
Continuity mistake: When Dr. Brockton is descending into the cave her hair changes from one style to another.
Continuity mistake: The wooden box (holding the "silver bullets" that the sheriff is handing out) has no markings on the side from a distance, but when the camera zooms in to see the ammo, you can see heavy black marks like someone crossed out a name and address, and you can also see a paper label partially torn off the box with writing blacked out. Then when the camera zooms back again, and the deputy picks up the box, the side of the wooden box is blank again. (01:21:20)
Continuity mistake: Professor van Helsing and Doctor Seward enter the Harkers' bedroom. A few seconds later, they enter the bedroom again. (00:52:00)