Cigars of the Pharaoh Pasha showing Tintin a copy of "Tintin in America", in the 1955 version this was changed to the earlier "Tintin in the Congo", and Hergé would change it again for subsequent printings, this time to "Destination Moon" (1953), an "Adventure" set chronologically after "Cigars". Benoît Peeters exclaimed that with this scene, the reader can imagine Tintin's surprise at encountering an adventure he had not yet had and which included the characters of Captain Haddock and Cuthbert Calculus whom he had not yet met. Another anachronism in this version appears when Snowy refers to Marlinspike Hall, the ancestral home of Captain
The Secret of the Unicorn story was adapted for the 1957 Belvision animated series, "Hergé's Adventures of Tintin", for the 1991 animated series "The Adventures of Tintin" by Ellipse and Nelvana, and for the feature film "" (2011), directed by Steven Spielberg. While browsing on the Brussels Voddenmarkt/"Marché aux puces" at the Vossenplein in the Marollen, Tintin purchases an antique model ship which he intends to give Captain Haddock. Two strangers, model ship collector Ivan Ivanovitch Sakharine and antique-scout Barnaby, independently try to persuade Tintin to sell the model to them. He also sees the two police detectives, Thomson and Thompson, on the look out