Camelot (1967)

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.

King Arthur as a Boy: What's the best thing for being sad?
Merlyn: The best thing for being sad is to learn something.