Many of the biggest movies in Hollywood are based on historical events, meaning factual-based mistakes are often made, especially with costumes.

Braveheart, Gladiator and Pirates of the Caribbean are just a handful of movies that have caused uproar with their inaccuracies.

Here are a collection of shocking costume mistakes from some of the biggest movies ever:

Back to the Future

During the prom scene in 1955, McFly(Fox) was strumming a Gibson ES-345 guitar even though these were not made until 1958.

Braveheart

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In Braveheart, William Wallace wears a kilt, but he actually lived around the year of 1300. Kilts weren’t worn in Scotland until the 16th century.