Corrected entry: In the final battle before Lancelot appears, Percival, Kay and Arthur are in a circle surrounded by enemy knights. Kay accidentally hits Arthur on the back of his head with his sword. Arthur grabs his head and is visibly staggered by the blow. (02:10:00)
Corrected entry: Out in the forest Merlin sleeps and Arthur stands next to a branch along side Merlin's staff. A large snake slithers down, Arthur touches it and runs away. In the next shot the snake is gone. (00:32:20)
Correction: Since the species of snake is not native to Britain, it's entirely possible that the scene contains enchantments, wrought by Merlin, which are therefore not subject to the natural laws of physics.
Corrected entry: When Arthur pledges Lancelot into his service on the rocks after breaking Excalibur he calls him by name, even though Lancelot never told him his name.
Correction: Yes, he did. When Arthur and Lancelot speak prior to their joust, Lancelot introduces himself with his full name.
Correction: Something that could easily happen in a real battle.