A Night in Casablanca 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. Groucho Marx has said that an early draft named his character "Humphrey Bogus", a reference to the leading actor in "Casablanca," Humphrey Bogart. Warner Bros. did not actually litigate, or even threaten to litigate, but it did issue a formal inquiry to the Marx Brothers concerning the plot and script of the film. The Marx Brothers exploited the situation for publicity, making it appear to the public that a frivolous lawsuit was
A Night in Casablanca film "Casablanca." Groucho responded with a letter asserting that he and his siblings had use of the word "brothers" prior to the establishment of Warner Brothers (and many others had before that), and often the story is told that Groucho threatened a counter-suit based on this assertion. 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: "A Night at the Opera" and "A Day at the Races". The true story is that the original