Sword of the Valiant (1984)

Other mistake: Early in the movie, Sir Gawain gets on his horse, in a full suit of armor, by himself. Later, he is hoisted onto his horse by what looks like an early design for a crane. Armor is heavy and Sir Gawain would have to be hoisted every time he wanted to ride with armor on.

Sir Gawain: I forgot to ask one question during my quick initiation into knighthood.
Humphrey: Oh? What's that?
Sir Gawain: How to relieve myself in this tin suit.