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: 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.
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)
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)
Other mistake: The exhaust of the space ship is so strong that it knocks down Jeff and Paula to the ground, but their hair doesn't get changed at all.