Continuity: There is a scene about 2/3 of the way in the movie where you see Jamal (Martin) standing by the lake and his chain is under his shirt, he looks back into the forest and his chain is hanging out of his shirt, then he goes back to the lake and his chain is under his shirt again.
Great sites
Mistakes
When Jamal is held prisoner, he is in a small cage, barely able to move. In the next scene, however, the cage is twice as large, with plenty of room. See more...
Black Knight mistakes
Factual error: There is a scene where we can see several flags hanging on the wall of the castle. These are supposed to be flags in the Middle Ages. However, one of them is the present day banner of the Hungarian Republic (where part of the movie was shot).
Continuity: When the woman is putting a rag on the head of unconscious Jamal, she notices the medallion around his neck and holds it to look at it. When he suddenly sits up, the medallion is tucked into his shirt.