Continuity mistake: Morgana becomes old after she recites "The Charm of Making". They use another older actress to portray her and she's wearing the same costume and head dress but they neglected to put on the long dangling earrings that she was wearing in the previous shots when she was younger. (02:07:00)????
Continuity mistake: After speaking to Arthur, Mordred catches up to and kills Uryens by the lake with his spear. The close-up of the spear in Uryens' back shows beads dangling about one foot from the tip. In the long shot of his body we see a different spear with no beads at all, just a short dangling piece of rope. (01:48:45)????
Continuity mistake: King Arthur asks Merlin where evil is in his kingdom and he replies, "Always where you never expect it, always". In the next shot Morgana walks back to her seat at the table as Gawain blurts out, "I know where" but then two shots later we see her back at the wall where she was speaking to Merlin. (01:10:20)????
Continuity mistake: As King Arthur addresses the Knights of the Round Table he says, "Only the Grail can restore leaf and flower" and Perceval and the other nights are facing him. In the next shot Perceval and the knight to the left of him are facing forward with only their heads turned towards Arthur. (01:35:30)????