Continuity mistake: When the engines are laughing at Thomas, Henry's eyes are wonky.
Edward, Gordon and Henry - S1-E4
Continuity mistake: When Henry comes out of the tunnel, he's dirty, in the next shot, he's clean.
Edward, Gordon and Henry - S1-E4
Continuity mistake: When the Fat Controller is asking Henry to pull the train, Gordon vanishes.
Edward, Gordon and Henry - S1-E4
Continuity mistake: When Edward is sad, the background behind him disappears between shots.
Edward, Gordon and Henry - S1-E4
Continuity mistake: When Edward arrives and tries to push the coaches. In one shot of Gordon on the siding in front of Henry, Gordon's eyes go to his left without moving.
Continuity mistake: In the shot of Thomas stopping inside Knapford with his coaches, Henry is in his new shape.
Continuity mistake: When Henry leaves the docks, there's nothing on his footplate, but when he's out of the docks, there are suddenly 2 lamps on his footplate.
Continuity mistake: After Thomas organized the trucks, he is facing the trucks, then suddenly he is facing away from the trucks instantly.
Answer: Breakdown trains help the engines back on track.