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.
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.