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.
Wrong Road - S2-E22
Revealing mistake: When Gordon says, "I am Gordon! Stop! Stop!", his eyes are wonky.
Thomas and the Billboard - S12-E1
Revealing mistake: At the beginning of the episode, Henry has Gordon's face.
Audio problem: In the US version (Rusty Helps Peter Sam), Peter Sam has a different whistle sound after the trucks hit him. And throughout the episode, a lot of music and sound effects are missing.
Visible crew/equipment: When Percy passes the Coaling plant, a camera shadow is visible.
Visible crew/equipment: When Thomas puffs away from Toby, two steam platforms are visible.
Visible crew/equipment: In the shot of Thomas rolling backwards onto the turntable, look left very carefully, and you'll see a camera tripod visible. Fullscreen version only.
Revealing mistake: When the elephant is loaded into the truck, the tracks abruptly end behind Charlie.
Samson at Your Service - S18-E24
Revealing mistake: James is shifted on his body when Samson leaves him.
Visible crew/equipment: When Stepney puffs through the fog after dropping off the stone loads, studio equipment can be seen in the top left corner of the screen.
Visible crew/equipment: When Thomas says to Emily, "Give them back!", studio equipment is visible on the top-right corner of the screen.
Visible crew/equipment: When Henry puffs under the bridge, studio equipment can be seen in the top left corner.
Visible crew/equipment: When Diesel is on the turntable, camera equipment is reflected in the windows for several moments. (00:02:00 - 00:10:00)
Visible crew/equipment: When Bill and Ben are shunting, we can see hands. (00:02:00 - 00:10:00)
Thomas and the Billboard - S12-E1
Other mistake: In the opening scene when Edward and Henry can be seen going into Knapford, Henry is wearing Gordon's face mask.
Other mistake: When James crashes into the tar wagons, Sticky Tac can be seen on his tender.
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.
Audio problem: In the extended Season 19 version of "Engine Roll Call," Henry's whistle sound is out of place as it can be heard during Emily's part of the song. Also, Henry is not mentioned in the Season 22 version of the song, but his whistle sound can still be heard.
Thomas, Percy and the Squeak - S6-E21
Continuity mistake: When Percy arrives at Brendam, his steam platform is visible and some of the steam from his funnel disappears, indicating a film cut.
Answer: Breakdown trains help the engines back on track.