Factual error: "Robin & the Sorcerer, Part 2": Kirkley's Abbey has a modern-day asphalt road running past it. (00:04:15)
Factual error: "Robin & the Sorcerer Part 1": During the archery tournament, several close-ups reveal that the arrows have 20th Century stainless steel tips on them. You can see the machine-tool marks on the shiny metal. (00:15:20)