The Crab with the Golden Claws: Part 1 - S1-E1
Continuity mistake: When Tintin throws the planks of wood through Captain Haddock's porthole, they land on his head. Haddock turns his head and his glass of whiskey is almost full to the top. He then turns back to his table, saying "Back stabbing scallywags", and there is now less whiskey in his glass. (00:15:20)