Continuity mistake: When the time traveler is first starting to travel in time, the sun moves across the window from left to right, indicating that the window faces south. When night arrives, however, the view is of the stars moving right to left, indicating that the window is facing north.
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.
Add timeGavin Jackson
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.
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...
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.
Add timeGrumpy Scot
Continuity mistake: When George stops his time machine at 802701 A.D. he stops it too fast and falls out of his time machine. While he's lying on the ground rain falls out of the sky and only lands on him and a little bit of the ground. When George stands up however his hair and his clothes are completely dry and steam is rising from the ground.
Continuity mistake: When George stops in 1917 he kicks some planks from a fence that has 4 small signs and a plank missing, in the next shot 3 signs are gone and the missing plank is reattached. After he talks with Filby Jr. he climbs back through the original fence (the one with the missing plank and 4 small signs, plus 3 other ones that were out of sight in the first shot).
Continuity mistake: When the Time Traveller gets back into the machine after the volcano scene, because the numbers are turning so fast, you can only see the first number; the first time you see this, the first number says 8, then 9, indicating 8,000 then 9,000 years, then it cuts to the Traveller for a second, and when it is seen again, it says 8,000 then 9,000 then 10,000.
Other mistake: When George climbs into the Time Machine for its test run, he becomes fascinated with the changing fashions of a mannequin in a store window across the street. As he watches the mannequin, the days and nights are flashing by, as indicated by the studio set lights changing from white light to blue light, and by the exterior lights of the building, which switch on at night and off in the day. At first, the shopkeeper appears in the window, also, changing each costume on the mannequin one-by-one. As the shopkeeper labors to change a single costume, the exterior day/night lighting changes three or four times, indicating that the shopkeeper improbably spent three or four days, working day and night, to change just one costume.