Revealing mistake: As the spaceship heads back into space, it leaves the same way that it crashed - they reversed the film. (01:18:30)
Revealing mistake: Richard Carlson almost falls into a hole in a cave. He catches himself and then a rock falls into the hole. The rock must have been some ten feet away, to his left, from where Carlson stumbled. (01:11:10)
Revealing mistake: Carlson touches a conical drive generator which was shooting rays into the spaceship. The cone swivels a few degrees to the right, but the rays don't move. (01:15:35)
Revealing mistake: The old telephone repairman is shot at by the posse as he is driving his repair truck. The bullets hitting the windshield leave black marks, but it is hard to tell if it is a special type of glass or paint balls when the "bullets" hit. Why? There are NO holes in the windshield as you can see in the close-up of the actor in the truck face-on. (01:09:05)
