Visible crew/equipment: In the opening shot of the restored version, studio equipment is visible in the top-left corner.
Other mistake: In a close-up of Thomas, Annie and Clarabel are nowhere to be seen.
Thomas the Tank Engine & Friends (1984)
2 mistakes in Thomas and the Guard - chronological order
Starring: Alec Baldwin, Michael Brandon, Ben Small, Martin Sherman, Michael Angelis
Duke: Excuse me. Are you a vandal? Driver told me vandals smash and break things.
Trivia: The events of this episode were remade in CGI for the 2015 special, The Adventure Begins.
Question: Why was Henry put on a barge instead of being taken to the works?
Answer: He was in the water.