Continuity mistake: There is a scene when King Arthur is just starting the Round Table. All the knights are gathered and bow on their knees to Arthur and King Pelinor who ceremoniously holds the sword Excalibur. But King Pelinor doesn't arrive in Camelot until after the following scene (which is May Day). (00:37:00)
Continuity mistake: The garden on the left side of the road to the Camelot castle changes in height, dramatically, from scene to scene. When Lancelot first encounters Arthur the garden is freshly harvested and cut. Later, the garden is lush and green.
Continuity mistake: In the garden where Lancelot and Guinevere secretly meet, Guinevere has a ring which she wears on the upper joint of her finger. It vanishes halfway through the scene.