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: Several knights joust and the winner has the right to try to pull Excalibur out of the stone. The winner tries but cannot do it and sets the sword rocking back and forth in the stone. The shot lasts until Excalibur stops moving, then in the next shot it's wobbling back and fourth again. (00:26:00)????
Continuity mistake: At the beginning of the movie Merlin says, "Show the sword" and we see Excalibur for the first time in a human hand. Uther at first holds the sword with his thumb wrapped around the handle, then in the close-up his thumb is pointing upward then in the next shot his thumb is wrapped around the handle again. (00:03:55)????
Continuity mistake: We see Morgana for the first time as she stands in the back of the wedding and turns around to look at Merlin. The order of the guests in front of her does not change but the banners above their heads are entirely different as she approaches Merlin in the next shot. (01:00:45)????