Thomas, Percy and Old Slow Coach - S5-E16
Other mistake: When James cries for help, his eyes are wonky.
Thomas the Tank Engine & Friends (1984)
1 other mistake in Thomas, Percy and Old Slow Coach - chronological order
Starring: Alec Baldwin, Michael Brandon, Ben Small, Martin Sherman, Michael Angelis
Continuity mistake: When Bulgy is driving on the road next to the rails, Thomas can be seen pulling a train instead of being repaired at the foundry.
Duke: Excuse me. Are you a vandal? Driver told me vandals smash and break things.
Thomas' Christmas Party - S1-E26
Trivia: At the end, the podium on which The Fat Controller is standing, is made of LEGO bricks.
Question: Why was Henry put on a barge instead of being taken to the works?
Answer: He was in the water.