A popular story (spread in part by Groucho himself) surrounding the movie is that the Marx Brothers were threatened with a lawsuit by
Warner Bros. for the use of the word "Casablanca" in the film's title due to it being an infringement on the company's rights to the 1942 film
Casablanca. He also mentioned that he would consider further legal action by pointing out to Warners that the title of their current hit film
Night and Day infringed on the titles of two Marx Brothers films released by
MGM:
A Night at the Opera and
A Day at the Races. The true story is that the original storyline for the film was intended to be a direct parody of
Casablanca, with the characters having similar-sounding names to the characters and actors in the 1942 film. Warner Bros. did not litigate, nor threaten to litigate. However, the studio issued a formal inquiry to the Marx Brothers concerning the plot and script of the film. There is no evidence that Warner Bros. ever responded to any of Groucho's letters. Producer David Loew told the Hollywood Reporter that he had reached an arbitration agreement with Warner Bros. to use the title
Adventures in Casablanca. The film was eventually retitled
A Night in Casablanca. The Brothers publicized the name change and released advertisements with a list of different "Casablanca" titles such as "'It Happened One Night in Casablanca' or Anything the Mayors of Casablanca Warner Brothers will permit." Ultimately, the matter ended without legal action, and the storyline of the film was changed to be a send-up of the genre rather than
Casablanca specifically. == Production ==