Pirates of the Caribbean (The Curse of the Black Pearl): Redcoats – No Such Thing Then
This is not just an error in wardrobe. There shouldn’t be any Red Coats in the movie The Curse of the Black Pearl. The Royal Marines didn’t wear the uniforms during that time. It wasn’t until 1747 when the unit came into existence. This is two decades after the film’s setting.

Pirates Of The Caribbean The Curse Of The Black Pearl
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Seabiscuit: Strapped Helmets Didn’t Exist Yet
Toby Maguire was a jockey in the movie and wore a strapped helmet which only became popular in 1956. The headgear made for an unforgettable sight, but it’s worth noting that the film was set in the period of the Great Depression.

Seabiscuit