Visible crew/equipment: Right after Dracula says "My blood now flows through her veins", he then walks across the room. As he does this, watch the lower right corner of the frame and you'll see revealed for a moment a big glaring light "hidden" on the floor behind the couch. (00:58:45)
Visible crew/equipment: When Dr Frankenstein asks to the monster to enter the room so that Dr Waldman can see him, you can see the shadow of the crew moving on a pillar as the camera follows them. (00:31:20)