King Arthur: Everything
So they movie is based on a myth, but still, you’ve got to have your facts straight. So things like modern day shoes in the middle of the 5th century is not quite accurate. Aside from that the armor plates that the soldiers wore were waaay to heavy for what Sarmatian knights would have worn into battle.
Zulu: Shaved Faces
During the Zulu war with the British colonialists, British soldiers wore prominent handlebar mustaches, and did not go clean shaven. Sure times have changed since 1879, but this can’t be overlooked.