A Night at the Opera (film) DVD commentary. But this could not have occurred, because Sam Marx had died in 1933, during pre-production of "Duck Soup", two years before "A Night at the Opera" was released. The rumor arose because Frenchy had had such a cameo appearance in the Marx Brothers' earlier "Monkey Business". There is, however, a reference to the Marx Brothers' mother, Minnie Marx, during the stateroom scene, in which a woman asks, "Is my Aunt Minnie in here?" Part of the concept of casting the Marx Brothers as stowaways on a ship was recycled from "Monkey Business". As Groucho's and Margaret Dumont's characters
Monkey Business (1931 film) while constantly trying to evade the ship's crew. Prior to this development, the film has no real plot, with the Brothers merely causing unending uproar. Except in the credits and in the screenplay, the Brothers' characters have no names in this film. They are referred to simply as "the stowaways". After arriving stateside, one of the gangsters kidnaps the other's daughter, leaving it up to the brothers to save the day. Writers S. J. Perelman and Will B. Johnstone were excited to be working with the Marx Brothers, but producer Herman J. Mankiewicz advised them to lower their expectations, calling