Revealing mistake: When Edward opens the gate to let Tracy in, we then see a shot of Tracy and you can see it is repeated footage of her from when she met Edward for the first time.
Other mistake: In the end credits, Juliet Waley is credited as "Juliet Way."
Trivia: The Tall Knight is played by Peter Mayhew, best known for portraying the Wookiee Chewbacca in the "Star Wars" movies.