Visible crew/equipment: In the scene where James pulls up beside Gordon, studio equipment is visible in the top portion of the screen.
Other mistake: In some shots of Percy in the water, his boiler is chipped.
Other mistake: When Bill and Ben are pushing each other, Bill has no eyes, Bill and Ben's faces are slanted at the bottom, and Ben's cylinder pipe is crooked along with a tack above Bill's face seen.
Thomas and Percy's Christmas Adventure - S3-E26
Audio problem: When this episode was re-narrated in the US, it was changed to an episode about Thanksgiving. This caused a scene to get cut, which messed up the dubbing track, making half of the episode out of sync. (00:03:00)
Revealing mistake: While the passengers are evacuating the station, the platform moves, a pillar in the background moves, and putty can be seen on the platform (stains of it) and on some passengers' feet.
Visible crew/equipment: When the trucks are pushing Toby, in one shot you can see a crew member's hand pushing the trucks, then it vanishes.
Thomas, Percy and the Dragon - S3-E7
Revealing mistake: When Thomas asks Percy about the guard leaving the light on, Thomas' right eye jitters.
Thomas, Percy and the Dragon - S3-E7
Visible crew/equipment: When James passes Percy, two studio lights and a crew member are reflected in James' paint.
Edward, Trevor and the Really Useful Party - S3-E16
Visible crew/equipment: When Bertie is talking to Trevor, in one shot of Trevor, studio equipment is visible in the top left hand corner.
Other mistake: After Toby breaks down, James pushes him directly to Knapford Station, not to the Works as it is said.
Other mistake: When Percy meets Thomas at Elsbridge Station, he has a water line across his boiler, even though the water only came up to his footplate.
Other mistake: When Oliver leaves for the Works after his accident, Toad's eyebrows are missing.
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.