Revealing mistake: After Forrester picks up the school bus sign, there's a shot of a Martian machine blasting at a bridge. Looking closely, the light poles can be seen through the machine, showing the model was matted over the background.
Revealing mistake: In the first scene of the crashed meteor, on the extreme left of the scene where the smoke is, it seems to be billowing up from behind a stage wall, as there is a definite vertical line and a gap between the smoke and the left edge of the frame.
Revealing mistake: Near the beginning, when the giant fiery comet hits, it goes behind a hill, yet you can still see the glow of the comet through the hill and the shops in front of the hill, revealing it is a backdrop. (00:04:20)
Revealing mistake: A second martian saucer crashes but it is the same as the first but reversed (look at the striped awning to the store window for both shots). (01:23:25)
Revealing mistake: The tri-lens is now facing the movie camera and not facing down towards the table top when Barry attacks the Martian. (00:52:25)
Revealing mistake: When the military starts firing, not only do you see the wires holding the saucers, but the "electromagnetic shields" can be seen as glass or plastic domes, as the studio lighting is reflecting in them.
Revealing mistake: As the command post is engulfed by fire, one (stuntman) soldier comes crashing through and over a table. As he does, the gloves he wore to protect his hands during the fire scene are visible. Nobody else was wearing gloves. (00:38:00)
Revealing mistake: As Forrester is easing up to check the Martian arm, a second Martian flyer crashes. As it does, you can tell that it is a re-use of the first one crashing, but flipped so that it's hitting left side first rather than right side first.
