In one of Paul Giamatti's first movies (Singles) he plays "Kissing Guy". A guy who gets offended when Campbell Scott's character stares at him and his girlfriend making out in a restaurant. Both Paul Giamatti (Chuck) and Campbell Scott (Colin Drache) star in this episode of Billions.
Chuck (Paul Giamatti) mentions that Howard Stern's friendship with Rosie O'Donnell came as a shock to him. In real life Paul Giamatti played Howard's boss in "Private Parts". Teaching him how to say "Doubleya ENNNN BC" for the call letters of the radio station Howard started at.
Colin Drache (Campbell Scott) shares some concerns about the state of New York's transit condition that are very similar to the concerns that Steve Dunne (Campbell Scott) in the movie "Singles" about Seattle.