Revealing mistake: In the opening shot after the title card, when the engines are gathered, Bill and Ben's wheel sets are not rendered on their chassis properly, as their cylinders appear to be protruding through their buffer beams. Also in this scene, Stanley seems animated too low, making it seem like his wheels are inside the rails.
Revealing mistake: When the camera is on Thomas' boiler, capturing Bill and Ben puffing away from the water tower, Thomas is not placed on the rails correctly.
