Continuity mistake: While avoiding the glowing meteoroid, they decide to fire their jets to push them into a higher orbit. In a couple of scenes they go up but a third one has them going back down.
Continuity mistake: About 25 minutes into the film, Vincent Price puts two vampire bodies into the back of his station wagon. Viewed from the open rear door, the woman is on the right side face up and the man is on the left side face down, and he drives off to the pit. In the next scene, he parks the car at the pit and when he goes to unload the bodies, the woman is now on the left side face down and the man is one the right side face up. For people who have died and then been killed again, they sure did move around a lot in the back of that car.
Continuity mistake: Watch carefully as Bedford falls through the crystal prism into the underground city. On the surface he has his helmet on but in the very next shot, as he plummets down, he has no helmet. He explains that it must have 'fallen off' but you do not ever see it doing so. As the helmet would have to be twisted to be released, and no such action took place, it cannot have come loose.