Visible crew/equipment: As the camera moves in on the bull that is about to be grabbed by the vampire, if you look under the bull, you can see two men hiding behind it. You can see their legs. They are probably there to keep the bull standing still. When it cuts they are gone. (00:26:05)
Continuity mistake: In the beginning after Dr.Frankenstein has awakened his monster he turns around and runs against the window. As he runs you can see a rack of a kind standing in front of the window. When it cuts the rack is gone. (00:00:55)
Answer: During their conversation Dracula is able to move around the room without Viktor noticing it. Then Dracula is standing on top of the fireplace behind Viktor, that's why he turns his head the first time. When Dracula suddenly slams the chest Viktor is surprised to see Dracula suddenly standing in front of him so he instinctively turn his head to look at the fireplace to believe his own eyes.
Mortug