Factual error: A "wonky" whistle doesn't sound like a slide whistle, it should sound like a weakened version of the correct whistle mixed with the hissing sound of steam. A "wonky" whistle would also leak steam constantly instead of being blown like a normal whistle.
Factual error: When Bertie finds Thomas derailed, Bertie is on the wrong side of the road. The UK drives on the left. Also, Thomas runs under North American directional rules at the beginning and end of the episode.
Factual error: In the "Steamie or Diesel" game on the "All Aboard with the Steam Team" DVD, Spencer is incorrectly called a diesel even though he is a steamie. Whenever you get the wrong button, Spencer says he actually has a horn instead of a whistle and even says he is a diesel engine.
Factual error: When Spencer brakes after he hears Percy whistle, his bogey wheels spark, but they do not have brakes.
Factual error: Black smoke comes out of Henry's cylinders, when it should only be coming out of his funnel.
Factual error: At the beginning of the episode, the narrator says that Connor and Caitlin are faster than Spencer, but Spencer, an LNER A4, holds the world speed record for steam locomotives.
Flour Power - S9-E26
Factual error: The narrator says "Suddenly, Thomas felt something touch his tender," but Thomas is a tank engine. "Bunker" is the correct term.
Factual error: In the U.K. narration, when Flynn sees Gordon, the narrator says "Flynn steamed in to a stop." but Flynn isn't steam powered. This mistake is fixed in the U.S. narration.
Factual error: At the beginning, the first shot of the episode, you can see cranes in the back of the station. They only have cranes at the harbor, not at stations.
Factual error: The dam was built concaved from the water it holds back, but it would have been built convex in order to do so.
Answer: Breakdown trains help the engines back on track.