Continuity mistake: When Edward and Tracy open the lid of the chest in the tower, Benger puts his hand on Tracy's shoulder and Edward has both his hands on the lid. In the next shot, he now has one hand on it.
Other mistake: In the end credits, Juliet Waley is credited as "Juliet Way."
Trivia: Peter Mayhew appears uncredited as the Tall Knight at the very end of the episode.