When Count Karnstein sacrifices the girl in the altar, in one shot we see her face while the knife hits her heart, and she is looking to her right screaming. On the next shot, while the Count puts the knife out, she is dead and looking to her left.
When Gerta first stands up from the dinner table you see her chair falling backwards silently. Then in the next shot you see it is once more upright and then falls backwards again, this time with a loud bang when it hits the floor.
Gustav (Peter Cushing) preparing to go out pulls his collar up , before putting his cloak on, with the intention of the cloak being under the collar but he wraps it over the collar. The camera then goes into a close up of his back and the collar is pulled down over the cloak.
Count Karnstein bites Frieda on the left side of her neck after which she never bears any bite scars as vampires always do.
When Peter Cushing and his gang pass the cemetery the camera pans past a massive crucifix. But, when it pans across the creepy graveyard, the headstones are all in Hebrew.
When Joachim is being attacked, a spear is thrust into him. Before the spear penetrates his leather vest, blood is already gushing out.
Concerning all vampire bite marks. All bite marks are aligned with the victim's jawline instead of perpendicular to it. This is an angle that would be quite impossible to bite from. Bite marks are consistently presented in this manner, whereas the vampire bite scenes show a different angle of approach.
Attire anachronisms are evident. The witch burning Brotherhood, led by the Peter Cushing character, are dressed as 17th Century Puritans. Some of the men in the town wear tri-corn hats common in the late 18th Century. The students in the girls school in town, along with their pretty teacher, have clothing and hair styles common in the mid-19th Century.