Factual error: When the Victorian astronauts are on the moon they are dressed in deep sea diving suits - without gloves.
Factual error: Draper consults a recorded video-lecture on survival tips while on Mars. Behind the lecturer is a chalkboard with two force laws from physics written. One is Newton's law of gravity, the other is Coulomb's law for electric charges. The constant of proportionality for Coulomb's law is given as e0, whereas this is really only one component in the whole expression for the constant, 1/e04pi.
Factual error: This movie tries as best it can to convince the viewer the action is happening in the states even though it was shot in Italy. (1) during a news report, the term 'his excellency the governor' is used which is used nowhere in the states. The rest of the newscast is equally odd. (2) the architecture is definitely 1950s Italy. (3) there is almost a complete lack of American automobiles; most of them are Fiats. (4) you can see Lebanese cedar trees everywhere trimmed in the Mediterranean style (tall and skinny). There are many more too numerous to go into.
Suggested correction: Is this really a mistake? H G Wells wrote "The First Men In The Moon" over 1900-1901 before the invention of the aeroplane, when space travel was still a fantasy. By 1964 Yuri Gagarin and Valentina Tereshkova had flown into outer space, so the makers of this film knew what sort of equipment would be needed if you really wanted to make a trip to the moon. And this film shows astronauts in suits copied from those worn by actual astronauts. But the idea of the original book, and this 1964 film, was that a (very) eccentric English Victorian scientist led an expedition to the Moon. So, surely, if Victorian Englishmen and Englishwomen went to the Moon, they would have used the technology available at the time. Beside that, when they reach the Moon they find it is inhabited. Even in 1900 astronomers knew there was no life on the Moon. I don't think this film was meant to be taken too seriously, and that when they made the film they deliberately dressed the cast in deep sea diving suits as a joke.
Rob Halliday