Revealing mistake: A horse gallops through a field and you can see a telephone pole.
Continuity mistake: In the scene at the end when King Arthur's funeral raft is floating away, you see white smoke coming from the wood at the foot of the raft. Cut to the shore, and the flaming arrow is lit and shot. Cut to the raft, and the flaming arrow hits the now smokeless raft in the spot where the smoke was. Cut to the shore, then back to the raft, where the fire begins to grow on both sides of the raft, nowhere near the now smokeless and flame-less spot where the flaming arrow hit in the previous shot.
Revealing mistake: In the raid scene where we first meet Malagant, a four-sided wooden tower is shown on fire, and then it collapses from the damage. However, the tower's front legs don't buckle and as it falls, the burning tower appears to be completely intact -- it has simply been pulled down by ropes that are partially visible from the front.
Continuity mistake: When they are in the forest in the rain after they escape from the bad guys castle; they have a back and forth moment where Lancalot's hair on his ear changes from shot to shot. When the camera is behind him you can see a thick rope of wet hair across his ear, and when the shot changes, the ear is clear of any hair.
Continuity mistake: In the scene towards the end where Richard Gere kills the leader of the bad guys, he steps back and at the bottom of the screen you can see that the sword hasn't got a proper blade - it has one that is about an inch long.
Continuity mistake: When the grey mare has escaped and Lancelot begins chasing her, watch her footfalls and listen to the hoofbeats - the two are totally out of sync.
Continuity mistake: After the town in the beginning is ransacked and burned, the leader of the pack is giving his speech about who is their leader. He carries a sword with serrations on one side towards the hilt. A shot of his horse is shown and the serrations of his sword are pointing out at the crowd. The shot switches to behind him and the serrations are pointing towards him.
Factual error: When Arthur marries Guinevere, the altar is decorated with yellow hybrid tea roses. Hybrid teas were not developed until the late 19th Century; yellow ones would not have been available in England until approximately the 1950s.
Continuity mistake: When King Arthur invites Malignant to Camelot, there is a list of things Malignant demands. King Arthur has the list in his hand but you never see Malignant give him the list.
Suggested correction: Prince Malagant was in Camelot at the Kings invitation. The explanation happens off-screen as King Arthur's messenger delivered his message to Malagant and then returned with Malagant's list of demands.
Continuity mistake: When Guinevere is being taken to Arthur they are stopped by a felled tree. But when you look out the front of the carriage, there's no tree on the road. Also, if the tree was really blocking the road, how could the horse and carriage suddenly charge off and easily get around this tree?
Continuity mistake: Closely watch the horses that are being used throughout the movie. The horse ridden by King Arthur and the one ridden by Maligant are one and the same. Also, the bay horse ridden by the stableboy is the same horse used to transport the kidnapped Guinivere to Maligant's castle. This would be okay, but both these horses are very distinct-looking, and it's painfully obvious that they're being shared.
Continuity mistake: When Guinevere is about to meet Arthur for the first time, her hair is down when she's in the carriage and when she steps down to the ground. However, in the next shot of her walking forward, her hair is in an intricate updo.
Revealing mistake: The scene with Richard Gere making his way through the gauntlet is the single worst display of blue screen work ever created.
Other mistake: When Malagant visits the Round Table, he places his sword at his old position but never retrieves it before he leaves.
