Robin Hood: Prince of Thieves
Even though Robin Hood isn't entirely based in reality, they did their best to keep the film as historically accurate as possible. The story of Robin Hood takes place in the year 1194. In one scene, the character Azeem uses a telescope. Telescopes weren't invented until the 17th Century, nearly 500 years later. This small detail was totally overlooked and the directors didn't care to be super historically accurate.
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