Factual error: Krakatoa is west of Java.
Factual error: Near the end of the film Butch is complaining about the living conditions they have to endure - jungles, swamps, snakes, night work - and Sundance sarcastically retorts "Bitch, bitch, bitch!" In 1908 the term meant just what it literally means: "Female dog." It did not adopt its current meaning of "complain" until much later. At the time the film is set - outside the context of "female dog" - it was considered to be a serious obscenity, and it would not have been used to describe something as ordinary as someone moaning about his living conditions.
Factual error: The door of the garage next to the house is of the aluminum up-and-over type, not available until the late 1960's.
Factual error: As director Ronald Neame himself points out in his commentary to the DVD, immediately after Sandy has been heating a piece of bread in the fireplace, she grabs the end of the fork on which it is placed and does not burn herself. (00:19:00)
Factual error: Lou Erding qualifies his car (42) in third, yet prior to engine startup, the famous "position pole" shows 42 as starting in 20th.
Factual error: Campbell is armed with what is described by Wayne as a "buffalo gun", a large bore rifle known for its power and substantial recoil. Campbell shoots a wild turkey with the gun and causes the meat to be severely damaged. Wayne comments, "Too much gun" emphasizing the power of the gun. However, when Campbell shoots the turkey with this "buffalo gun" there is no visible recoil.
Factual error: In the opening scene, a German buzz-bomb is shown falling on WWII London. In the background, a nuclear power plant can easily be seen. A double mistake of sorts, as there never have been any nuclear power plants near London, even after they were invented.
Factual error: In nearly every scene depicting someone or something in weightlessness (zero gravity), objects tend to start moving randomly without any initial propulsive force or, when already in motion, to been seen to randomly change direction of movement with no outside force acting upon them. Both of these are impossible in a true zero-G environment.