Other mistake: When the Fat Controller is talking to the crew, the buffers on the first coach in front of Thomas is crooked.
Other mistake: When Thomas is grumping, his lamp is dirty, even though he didn't do anything dirty yet.
Thomas the Tank Engine & Friends (1984)
2 other mistakes in Thomas' Train - chronological order
Starring: Alec Baldwin, Michael Brandon, Ben Small, Martin Sherman, Michael Angelis
Visible crew/equipment: As Peter Sam passes Skarloey and Rheneas, a camera shadow is seen.
Thomas: Wake up lazy bones - do some hard work for a change.
Thomas' Christmas Party - S1-E26
Trivia: At the end, the podium on which The Fat Controller is standing, is made of LEGO bricks.
Gordon Takes a Tumble - S6-E17
Question: How did they get Gordon's tender back on the tracks even though it was in a field very far from the rails?
Answer: Ropes and a winch.
Answer: Butch the breakdown truck must have pulled Gordon's tender all the way up the rails so the breakdown train can reach it and also Butch helped to get Gordon close to the winch.