The movie
Casablanca (1942) is referenced multiple times. At the end of "Chuck Verses the Nemesis" Bryce tells Sarah they "will always have Omaha". Chuck asks Casey if this is more that just a reference to Casablanca. At the end of "Chuck Verses the Undercover Lover", Chuck places his arm around Casey and quotes Rick's last line, "I think this is the beginning of a beautiful friendship." Chuck directly quotes the movie again in "Chuck Verses the Seduction" telling Sasha, "We'll always have Paris." It is also revealed in "Chuck Verses the Seduction" that Casablanca is Ellie's favorite movie.Also, John Casey's lover's name is Ilsa, the name of Casablanca's leading lady.
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