Thomas and the Rainbow - S9-E2
Audio problem: At the beginning, Henry has Gordon's whistle sound.
Audio problem: Gordon has a different whistle sound when he cuts in front of James at the water tower.
Starring: Alec Baldwin, Michael Brandon, Ben Small, Martin Sherman, Michael Angelis
Thomas and the Rainbow - S9-E2
Audio problem: At the beginning, Henry has Gordon's whistle sound.
Audio problem: Gordon has a different whistle sound when he cuts in front of James at the water tower.
Plot hole: When Duck and Diesel leave the shed, Diesel follows Duck instantly, but the tracks they are on both lead to the turntable. As they are on different tracks to each other, it would be impossible for Diesel to follow Duck that quickly as the turntable could only be set to one track at a time.
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.
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.