Before getting into "The Nordic Model," S5E6 of 'Billions,' cocreators Brian Koppelman and David Levien discuss the real billionaire art community, this episode's director Shaz Bennett, script-to-screen changes in location, the show's stellar sound department, revealing the layers of Chuck Rhodes Sr., a laundry list of obscure references, guest cast performances and more (0:50). They next speak with actor Stephen Kunken, who plays Ari Spyros, about joining the show as a guest star in the pilot episode, the change in his character's demeanor as the show progresses, "defending" Spyros to fans of the show online, and more (32:30).