Visible crew/equipment: At the end of the movie when they're escaping the morlocks, one of them catches on fire - he is obviously wearing a fire protection suit, since he is immensely fatter then the rest of the morlocks.

Plot hole: In 1966 when George is about to return to his machine and the atomic bombs (or whatever) go off, George just barely gets out of there before the lava from a nearby volcano cooks him alive. Two plot holes here. One is that in the short time it takes George to walk a few meters to his machine, a volcano explodes and the lava reaches him. Thats very speedy lava..especially considering there were no mountains near George's house. Secondly when the lava approaches, it is just flowing along the ground like normal. But when it reaches George, it splashes around him like a broken water tank. That lava can certainly defy gravity.

Revealing: As George comes to the year 1917, the camera shows that the buildings in the horizon are nothing but poor painting, especially on the wall around the archway. The two buildings right beyond it have distinct differences above and below the top of the archway.

Continuity: The Morlocks aren't affected by the light from metal in fusion in their foundry but they recoil from the light of a match.