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: 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: Arthur instructs Perceval to, "Take Excalibur, find a pool of calm water, throw the sword into it". No one ever removed the spear that Mordred thrust through his chest but now as Arthur dies it's gone. (02:13:25)
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)
Continuity mistake: Perceval throws Excalibur into the lake and we see that it's full of blood as it flies through the air, but as the "Lady of the Lake" catches it there's no blood on it. Then as she lowers it into the water there's blood on it again. (02:16:30)
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.
Answer: Sunshine is the name of one of Gueniviere's handmaidens. She is also mentioned in L'morte d'Arthur.