Killing of the Unicorn: Dorothy Stratten 1960-1980 is a book by Peter Bogdanovich detailing the relationship between Bogdanovich and Dorothy Stratten, the making of They All Laughed and Stratten's murder.
They All Laughed was the last theatrical film in which Audrey Hepburn played a lead role (she would later star in a made-for-TV film entitled Love Among Thieves and a cameo role in Always).
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Detective John Russo (Ben Gazzara) attempts to cheat on his girlfriend, country singer Christy Miller (Colleen Camp), with a blonde taxi driver he calls Sam (Patti Hansen), with the connivance of his colleague Arthur Brodsky (Blaine Novak).
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The theme of hidden desires is echoed in the soundtrack, which juxtaposes country music by Roy Acuff, Johnny Cash, Waylon Jennings, and Rodney Crowell—as well as by Camp—with visuals of the Manhattan skyline (the credits sequence follows a trek into Manhattan, notably focusing on the twin towers of the World Trade Center as Dorothy Stratten's credit appears) and songs by Frank Sinatra, including the eponymous hit "They all laughed when Christopher Columbus..."