Differences between the comic result in the film being set in New Orleans instead of London, the character of Groucho being replaced by an un-dead sidekick called Marcus due to issues for the production to acquire the rights to use the Groucho Marx name and style, another difference is Dylan Dog's Volkswagen Beetle being black with a white hood instead of the opposite like in the comic. The film also appears to be much lighter in tone and more action-oriented, lacking the surreal feeling, the black humour and the melancholy of the comic book, and the Dylan character is portrayed like more of a scientist-adventurer in the vein of Indiana Jones, rather than the romantic loner he is in the comics.