Revealing mistake: During the scene of James and Duck at Knapford station, Duck's footplate is clipping through the platform.
Suggested correction: Copy and pasted from Wikia. Needs to be removed.
Continuity mistake: Throughout the episode, rust stains disappear and reappear on Duncan's front buffers.
Samson at Your Service - S18-E24
Revealing mistake: James's chassis is incorrectly positioned when Samson passes him.
Duck and the Slip Coaches - S18-E8
Audio problem: At the beginning, Edward has Thomas' whistle sound.