Continuity mistake: Arthur ties a rope around the battlements and descends the tower's west wall. Tony then waves a torch to signal the soldiers to attack. He's standing at the same spot Arthur left from (the rope is still tied there), but in the long shot, his torch is waving from the tower's south wall instead of the west one. (00:41:15)
Continuity mistake: In the dungeon where Merlin reminds Doug and Tony they are from the future, Arthur's hands instantly move from by his sides to holding the collar of his tunic.
Continuity mistake: When Arthur has the standoff between himself and Doug and Tony, Doug is standing abreast of Tony in the frontal shots and slightly behind him in the views from the rear angles.
