Visible crew/equipment: In the scene where Sgt. Bung wakes up in the bath, he hits his head on the copper water boiler. However, you can see the white padding that will protect his head stuck underneath the bottom of the boiler. This is visible throughout the scene. (00:57:15 - 00:58:00)
Continuity mistake: During the search for Debbie; Margaret's scarf on her head disappears and reappears several times.
Continuity mistake: Helen attacks Diana in Dracula's castle and is burned by Diana's crucifix. In a jumble of shots Helen reacts to the burn; Diana is seen holding up the cross, then not holding up the cross, and then holding it up again. (00:59:20)
Revealing mistake: The zombie of John Martinus throws the lifeless body of Alice from the tin mine pit head onto the ground. When Sylvia examines the body after, Alice very obviously blinks. Visible at normal speed, but easier to see slowed down.