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
Casablanca (film) has been attributed to a comment Bogart said to Bergman as he taught her poker between takes. It was voted the fifth most memorable line in cinema in AFI's 100 Years...100 Movie Quotes by the American Film Institute. Six lines from "Casablanca" appeared in the AFI list, the most of any film ("Gone with the Wind" and "The Wizard of Oz" tied for second with three apiece). The other five are: Additionally, the line "Ilsa, I'm no good at being noble, but it doesn't take much to see that the problems of three little people don't amount to a hill