KingofDemons!

Dirty Objects - S1-E23

Visible crew/equipment: When James crashes into the tar wagons, a crew member's finger can be seen pushing him.

AAL117

James and the Red Balloon - S6-E15

Continuity mistake: When Percy arrives at the docks, he is carrying some freight cars. But when Thomas leaves the cars Percy was carrying disappear.

Comedyfan74

Toby's Tightrope - S3-E15

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.

Comedyfan74

Thomas and the Missing Christmas Tree - S2-E26

Visible crew/equipment: In the scene of Donald and Douglas going out of the yard, a camera tripod can be seen in the top left corner.

Thomas and Bertie - S1-E14

Other mistake: In a close up of Bertie, he has no driver.

AAL117

Thomas and Gordon - S1-E1

Visible crew/equipment: When Gordon, Thomas and the express round the bend, a camera tripod is visible on the left side of the screen.