At around 12 min - while in the cave, Nimue is walking with her sword drawn. Then upon hearing a distant snarl, she turns and the sword is visibly sheathed on her back. In the next shot she's seen walking with the sword in her hand again.
At 24 seconds, during the battle between the Weeping Monk and Arthur, when the Monk draws his sword and Arthur is on the floor, a crew member is clearly visible next to a tree on the left.