Revealing mistake: When Murdoch asks Gordon "What decorations will you have, Gordon?" his left eyebrow (viewer's right perspective) is scratched.
Revealing mistake: Salty is missing his rear lamp in the first shot at the docks and a hole is visible where it should be.
Revealing mistake: In a close up of Gordon after Rocky clears the tracks, Gordon has wonky eyes.
Revealing mistake: When Henry arrives at the forest where he finds his lucky trucks, one of the trees is not covered in snow.
Revealing mistake: When Toby asks Thomas if he took on enough water, Toby's eyes are wonky.
Thomas and the Billboard - S12-E1
Revealing mistake: At the beginning of the episode, Henry has Gordon's face.
Thomas Puts the Brakes On - S12-E17
Revealing mistake: When Stanley shunts Thomas into the yard, Thomas is eyeless.
Thomas Puts the Brakes On - S12-E17
Revealing mistake: In the very last shot of the episode, Thomas and Stanley are faceless.
Revealing mistake: In a shot of Gordon arriving at Brendam Docks, only half of his tender is visible.
Revealing mistake: When the elephant is loaded into the truck, the tracks abruptly end behind Charlie.
Santa's Little Engine - S17-E18
Revealing mistake: At one point, the shading effect on Thomas' whistle is not rendered properly, so it appears silver instead of gold.
Revealing mistake: Each time when Thomas takes a shortcut, the points do not change.
Revealing mistake: Duck's footplate clips through the platform at Knapford at the beginning.
Samson at Your Service - S18-E24
Revealing mistake: James is shifted on his body when Samson leaves him.
Revealing mistake: Some of the team members of the football team are duplicated.
Revealing mistake: The end of the set is visible in one shot at the quarry.
Revealing mistake: When Samson crosses the Vicarstown Bridge, there is no shadow effect on his face.
Revealing mistake: Max's wheels can be seen moving backwards when he is actually driving forwards. Also, both Max and Monty's steering and wheel speeds are out of sync with their movements. These events happen throughout the episode.
Revealing mistake: Before James collides with the tar tankers, he is already covered in tar before he actually hits them.
Answer: He was in the water.