Visible crew/equipment: When Percy passes the Coaling plant, a camera shadow is visible.
Revealing mistake: Salty is missing his rear lamp in the first shot at the docks and a hole is visible where it should be.
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.
Audio problem: At the beginning, Henry has Gordon's whistle sound. And when Spencer's driver rings the bell after stopping at the countryside, the bell is heard, but cannot be seen.
Character mistake: At the beginning, the narrator refers to the Quarry as the Smelters.
Audio problem: At the beginning of the episode, Salty has Diesel's horn sound.
Audio problem: Before Emily goes into the duck pond, her brakes are heard screeching but her wheels are still moving.
Answer: Breakdown trains help the engines back on track.