 During the scene in which Costello is "interrogating" the radio show  cast, he blurts out the question, "Where were you on The Night of  January 16th"? This is an obscure, throw away reference to the  famous Broadway play of the same name by Ayn Rand, the Russian born  novelist and philosopher who wrote "The Fountainhead" and "Atlas  Shrugged". "The Night of January 16th" was also made into a movie in  1941.