 The director of the later documentary "Dear Mr. Watterson" referenced "Looking for Calvin and Hobbes" in discussing the production of the movie, and Martell appears in the film.The American documentary film "Dear Mr. Watterson", released in 2013, explores the impact and legacy of "Calvin and Hobbes" through interviews with authors, curators, historians, and numerous professional cartoonists.The enduring significance of "Calvin and Hobbes" to international cartooning was recognized by the jury of the Angoulême International Comics Festival in 2014 by the awarding of its Grand Prix to Watterson, only the fourth American to ever receive the honor (after Will Eisner, Robert Crumb, and Art Spiegelman).