In the "mirror scene", Harpo, dressed as Groucho, pretends to be Groucho's reflection in a missing mirror, matching and mocking his every move. Eventually, Chico, also dressed as Groucho, joins the fun.
The movie was written by Bert Kalmar and Harry Ruby, and Arthur Sheekman (additional dialogue) and Nat Perrin. It was directed by Leo McCarey. Neither Harpo's harp nor Chico's piano are used in the film. This was the last Marx Brothers movie to feature Zeppo. It was not a box-office hit upon its initial release, as it left most audiences confused and frustrated. The movie has since been re-evaluated over time and is now seen as a classic satire of war.
The film is consistently on the Internet Movie Database's list of top 250 films, was #85 on American Film Institute's 100 Years, 100 Movies and #5 on its 100 Years, 100 Laughs, and has been selected for preservation in the United States National Film Registry.