Revealing mistake: When Bela Lugosi walks off screen, it's obviously a freeze frame. The swaying tree stops moving and even though he was hit by a car, his shadow is still visible. (00:07:55)
Revealing mistake: When the UFO makes the huge flash that knocks everyone in the cemetery down, one of the police officers kicks a tombstone as he falls and it wobbles back and forth. (00:13:35)
Continuity mistake: At the beginning of the scene where the pilot's wife is attacked in her bedroom by (not) Bela Lugosi, look at the pictures on the wall above the bed. After the attack begins, the pictures are different.
Continuity mistake: When the men first enter the spaceship, one of the windows shows an afternoon sky and the one next to it shows a nighttime sky. (01:11:20)
Revealing mistake: When the flying saucers leave the planet, you can see their shadows on the fake planet's surface.
Revealing mistake: The pilots are not sitting on normal seats like in every airplane, but on stools or boxes. (00:04:10)
Visible crew/equipment: When the pilots are driving the plane and a spaceship pass them you can see a shadow of a microphone. (00:04:40)
Revealing mistake: The American pilots fly the plane with no hands. (00:04:10)
Revealing mistake: It's amazing how little equipment is in the plane: a shower curtain, a thermometer, and a cardboard steering wheel. (00:04:35)
Revealing mistake: Jeff Trent, Col. Edwards and Lt. Harper grab some guns and take a walk in the graveyard, and a prop tree almost falls over as Col. Edwards walks by and brushes up against it with his shoulder. (00:57:30)
Revealing mistake: After Tor Johnson drops Paula the police officer comes over to try to wake her. The carpet that's supposed to be the ground crumples under his feet. (01:13:25)
Continuity mistake: During Criswell's opening narration, the time of the story changes from taking place in the future ("Future events such as these will affect you in the future.") to taking place in the past ("what happened on that fateful day..."). (00:02:30)
Visible crew/equipment: In the scene where Eros shows the men the monitor, look at the monitor carefully and you can see the reflection of the studio lights. (01:04:15)
Continuity mistake: A man at the old man's funeral says "It's getting dark out." It's already pitch black out. (00:08:30)
Continuity mistake: When the police are driving to the cemetery, it is daytime and their car is a standard police car with lights and sirens. When they reach the cemetery, it is night and the car is an ordinary car, without lights and sirens, and a different colour. (00:10:05)
Revealing mistake: Vampira flinches when Inspector Clay fires at her even though she's a zombie. (00:15:05)
Audio problem: After Tor Johnson drops her, Paula says, "Oh, I'll be alright" but her lips don't move. (01:13:30)
Revealing mistake: The woman at the graveyard lets out a scream as she sees the dead bodies. It's obvious that the bodies are dressed up store mannequins. (00:08:40)
Continuity mistake: The grave diggers are covering Bela Lugosi's wife's grave in broad daylight. In the next shot when Vampira comes walking out it's in the middle of the night. (00:06:20)
Audio problem: In the graveyard, as Paula screams when Tor Johnson opens the car door, her mouth is not moving in sync with what we are hearing. (01:00:30)
