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.Gavin Jackson
Revealing mistake: 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.
Revealing mistake: When the time-traveller enters the Morlock caves via the ventilation shaft, you can see (when the screen is bright) that the background of the cave behind the machine section is merely a painted screen.
Factual error: As the machine is traveling through time George becomes aware of "strange sounds" which, when he stops, turn out to be air raid sirens. At the speed at which he was traveling through time, the sirens would have had to operate continuously for several days in order for him to have been able to hear them.
Factual error: The time traveller can hear external sounds in his machine, which means that vibrations outside of his machine's bubble of space can penetrate it. If this were true however, the machine would be destroyed in mid-travel by the shockwave of the nuclear blast.
Continuity mistake: When the Time Traveler is almost overpowered by the Morlocks, there is a shot of the torch which was whipped out of his hand. It has nearly burnt down, but as he regains it and orders the Eloi to escape, it burns strongly again.
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.
Continuity mistake: At the very end of the movie, when Mr. Wells' housekeeper bids Mr. Filby goodnight, watch how quickly the upstairs lights get turned off after the downstairs lights. Considering that the time traveller was gone and she was the only one left in the house, that old woman must have RUN up those stairs faster than any human being could...
Factual error: When the machine is in the laboratory racing through time and the sun whizzes across the window, note that the clouds don't move or change formation throughout the entire 'day'. In reality, clouds can change and move dramatically in only minutes.
Plot hole: George is standing in the small park across from Filby's department store when an atomic weapon detonates. The cars in the street are instantly turned into burned hulks and the building crumbles and bursts into flame. However, George, standing no more than 20 feet away from both, doesn't even break a sweat! While shock waves from a blast can cancel each other out and leave things unhurt, the sheer thermal energy released should have severely burned him at the least.Grumpy Scot
Other mistake: When the land is getting destroyed by the volcano, George is in his time machine and the disc attached to it is already spinning before he even turns on the machine and throws the lever forward.