Marco Polo - S1-E4
Other mistake: In episode seven, Kublai Khan refers to backgammon as a game of cards....obviously he's not an experienced backgammon player.
Other mistake: Mace's chest camera sends images from impossible angles - including several that include Mace himself. At the end, his superiors watch him from a camera that's obviously mounted in a tree and not on his person. Yet when Mace smashes his chest camera, the transmission goes dead anyway. (00:48:00)