Cigars of the Pharaoh
In the 1946 colour version, Hergé added a cameo appearance from Thomson and Thompson, the two detectives that he had introduced in the fourth Tintin story, "Cigars of the Pharaoh" (1932–34), which was chronologically set after the Congolese adventure. Adding them to the first page, Hergé featured them in the backdrop, watching a crowd surrounding Tintin as he boards a train and commenting that it "Seems to be a young reporter going to Africa ..." In the same frame, Hergé inserted depictions of himself and his friend Edgar P. Jacobs (the book's colourist) into the crowd seeing Tintin off.