Revealing mistake: When Eleanor comes across the Thames there is no other boat around, however, in a shot from the side you see the bow wave of the boat with the camera crew. (00:17:15)
Revealing mistake: At the beginning of the movie Geoffrey organises an ambush on a group of infantrymen marching on a pristine beach. When the second group of horsemen attacks there are already tracks in the sand, obviously from previous takes. (00:08:55)