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Santa's Little Engine - S17-E18

Continuity mistake: The sleigh leaves tracks in the snow behind when it slides down the hill. When Thomas races towards the sleigh, the Snow Tracks disappear.

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Edward the Great - S8-E14

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.

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Wonky Whistle - S15-E17

Plot hole: Thomas or his crew should've realised that the whistle was "wonky" the first time it was blown.

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Wonky Whistle - S15-E17

Factual error: A "wonky" whistle doesn't sound like a slide whistle, it should sound like a weakened version of the correct whistle mixed with the hissing sound of steam. A "wonky" whistle would also leak steam constantly instead of being blown like a normal whistle.

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Mucking About - S20-E14

Other mistake: Thomas has two side rods when he crashes into the pile of dirt. The duplicated side rod moves even though Thomas' brakes are applied.

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Whistles and Sneezes - S1-E20

Character mistake: The narrator says that the passengers covered their ears at the station, but no one is covering their ears, except Sir Topham Hatt.

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Percy's New Whistle - S8-E2

Character mistake: At the beginning, the narrator refers to the Quarry as the Smelters.

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Percy Takes the Plunge - S2-E11

Deliberate mistake: When Percy is being loaded onto the flatbed, Diesel appears, but he is not introduced until "Pop Goes the Diesel" (episode after this). This is likely because "Pop Goes the Diesel" was produced before this episode.

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Henry Gets It Wrong - S12-E5

Other mistake: Henry was supposed to take Emily's trucks to the Coaling Plant, but he takes them to Knapford Yards instead. The narrator also refers to Knapford Yards as the Coaling Plant.

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Henry Gets It Wrong - S12-E5

Continuity mistake: When Salty gets blocked by the trucks, his face increases in size.

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Season 9 generally

Deliberate mistake: In the PBS airings in the U.S. of "Tuneful Toots" and "Duncan and the Old Mine", Rusty is referred to as a female rather than a male.

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Bulgy Rides Again - S7-E19

Continuity mistake: The mail van moves without a driver.

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Peace and Quiet - S7-E17

Audio problem: Douglas has Donald's whistle sound when he passes Murdoch.

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Respect for Gordon - S9-E6

Plot hole: When Gordon crashes into the goods train, it is not being pulled by an engine. So why is it just sitting on the mainline and not on a siding?

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Respect for Gordon - S9-E6

Audio problem: Gordon has a different whistle sound when he cuts in front of James at the water tower.

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Respect for Gordon - S9-E6

Character mistake: The narrator refers to Gordon as "Gordon's engine."

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Season 4 generally

Audio problem: Gordon had Duck's whistle sound and James had a different whistle sound in almost every Season 4 episode they appeared in.

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Rosie's Funfair Special - S12-E3

Audio problem: In the US version, Stepney says "Oh my!", but he doesn't sound shocked and his mouth doesn't match the words. In both US and UK versions: he blows his whistle multiple times, but it only emits steam once, and it sounds like Thomas' at a slightly higher pitch.

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Gordon and the Engineer - S11-E6

Continuity mistake: When Gordon is at the signal box, he drops off his coaches on his track and leaves. When he comes back with the mechanic, the coaches are gone.

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Gordon Takes a Shortcut - S12-E15

Audio problem: Stanley has a different whistle sound. His original whistle sound is essentially Thomas' at a lower pitch, but in this episode, it is Thomas' at a higher pitch.

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