Revealing mistake: The old engine's model, who fell off the bridge, was actually Skarloey's, as some red paint can be seen.
Revealing mistake: When the elephant is loaded into the truck, the tracks abruptly end behind Charlie.
Continuity mistake: When Rusty arrives on the Other Railway, chains are seen hanging beside the signal box, but in the next shot when Rusty asks, "Ooh! What's that?", the chains have disappeared.
Factual error: Henry is derailed on his side, but no coal spilled out of his tender.
Continuity mistake: When Henry sneezes at the boys, in the shot of the boys with the smoke rising up, you can see that they already got ashes on them before the smoke had even touched them.
Thomas' Christmas Party - S1-E26
Visible crew/equipment: When Toby puffs by at the beginning, a camera shadow is visible on the bottom right corner.
Thomas' Christmas Party - S1-E26
Revealing mistake: In the very last shot of the episode, loads of wires are visible in front of the engines and behind the turntable.
Fergus Breaks the Rules - S7-E18
Revealing mistake: A wire is under Fergus when he arrives at the smelter's.
Revealing mistake: When Gordon falls into the ditch, wires under his cab are visible.
Revealing mistake: When Samson crosses the Vicarstown Bridge, there is no shadow effect on his face.
Gordon Takes a Tumble - S6-E17
Continuity mistake: When Gordon leaves the docks, he has his lamp, but in the next scene, it disappears.
Revealing mistake: In a shot of Duck at the smelter's, a hole is visible on his running board.
Fergus Breaks the Rules - S7-E18
Continuity mistake: When Fergus runs away, his taillamp is on his right side. When he hides in the siding, his lamp is on the left side.
Revealing mistake: When Toby tells the Fat Controller about the broken windmill, his driver's head appears to have been digitally added.
Other mistake: In the first shot of Brendam Docks, there is a siding that is inaccessible from the other tracks.
Other mistake: The Breakdown Train to the left, in the opening scene, is derailed.
Revealing mistake: The end of the set is visible in one shot at the quarry.
The Great Little Railway Show - S24-E3
Continuity mistake: In one scene, Rex disappears and is replaced with Mike.
Thomas' Animal Friends - S24-E20
Continuity mistake: When Thomas passes by Crovan's Gate, James' side appears to be silver.
Cleo the Road Engine - S24-E17
Continuity mistake: Thomas' brake van changes design. From a black one, then to an orange one.
Answer: He was in the water.