Big Jake (1971)

Factual error: The scene where Jon Wayne's Son is shooting the deer at 600 yards, he swings his rifle about 20-25 inches in about 2 seconds - by my calculations the deer must have been travelling around 250 mph.

Factual error: The motorcycle that Michael McCandles rides is far too modern for the era of the film. It has twin coiled rear suspension and offroad tyres on it from a more modern 60/70s era.

Factual error: The semi-auto handgun is not a real Bergmann 1911. It is a Walther P-38 that was modified to look like a 1911 Bergmann, but when Michael shows it, he puts the magazine in the grip rather than in front of the trigger, as a Bergmann would require.