The Crab with the Golden Claws: Part 2 - S1-E2
Continuity mistake: The pilot of the seaplane Tintin and Haddock capture has white skin. A few scenes later on, when Tintin and Haddock are riding through the storm, Haddock and Snowy fall backwards and the pilot suddenly has brown skin. This continues throughout the scene until after Tintin is knocked out with the wine bottle and the pilot makes for the airlock where he suddenly has white skin again. (00:25:55)