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: When Arthur thrusts Excalibur through Mordred there's a dead white horse behind them. When we first see it, the head is facing away from them but later as Mordred falls dead the horse is reversed with the head closer to them. (02:13:00)
Continuity mistake: As Guinevere drinks from the chalice the priest gives them, she lifts her veil with the fingers of her left hand in a horizontal position. In the next shot her fingers are pointing upward. (01:00:25)
Audio problem: At the feast Morgana says to Gawain, "Watch Guinevere, remember what I told you about them," but her lips are not moving when she begins this sentence. (01:08:35)
Continuity mistake: When Arthur is dying after killing Mordred, he drops to his knees with the spear still through him. When Sir Percivle is next to him getting his last instructions, the spear is gone.
Continuity mistake: In the final battle as Lancelot lies dying the blood on his face, especially on his left cheek, changes in the close-ups as he speaks to King Arthur. (02:12:00)
Audio problem: Merlin comes to her bedchamber and tricks Morgana into using "The Charm of Making". As she recites the charm smoke comes out of her mouth and if you look closely at her lips, they're not moving in sync with the over-dub. (02:05:00)
Continuity mistake: Guinevere and Morgana walk down a staircase inside Camelot and get to the 10th step. In the next shot Guinevere notices Lancelot at the entrance and says hello and now they are on the 7th step. (01:06:30)
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: Lancelot prays, "God, save me from myself, purge me of this love so that I can defend her" as he stares straight ahead. In the next shot he's looking up. (01:13:50)
Visible crew/equipment: Lancelot's armor is so bright and shiny as he fights with King Arthur that it's impossible not to see the cast and crew's reflection shining in it. (00:49:50)
Visible crew/equipment: As Merlin asks for his son, Uther takes the child in his arms from Igrayne and the shadow of a crew member standing to the right of them off camera appears on him and the child. (00:17:15)
Continuity mistake: As Arthur thrusts Excalibur through Mordred we see a red and white standard to their left stuck in the ground that wasn't there in the previous shot. (02:12:50)
Continuity mistake: King Arthur extends Excalibur out to Lancelot who grabs it with both hands. At first Lancelot's right hand is at the tip of Excalibur but in the next shot his hand touches the sword about four inches away from the tip. (00:54:35)
Continuity mistake: Uther thrusts Excalibur into the side of the stone. In the next shot many years later, Excalibur is stuck into the top part of the stone. (00:23:15)
Continuity mistake: The horse that Perceval rides off on has straps tied around its hind quarters. In the next shot as he arrives at the lake the straps are gone and the color of the saddle is different. (02:14:15)
Visible crew/equipment: The crew's reflection can be seen as they stand in front of Arthur as he forgives Guinevere where she now lives, in a convent. (01:58:10)
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)
Audio problem: King Arthur addresses the Knights of the Round Table and says, "We must find what was lost, the Grail". If you look closely at his lips he's saying something else, not "the Grail". (01:35:20)
Answer: They were the Goddesses of Avalon. A group of women who each have a specific magical power. They were the makers of Excalibur, healed King Arthur's wounds from his first battle and took him to his final resting place, readying him for the day he would be needed again.
Most Arthurian myths attribute elves as making "Excalibur", and also "Clarent," King Arthur's other magical sword.
raywest ★