- David Letterman (Self - Host)
- Paul Shaffer (Self - Musical Director)
- Alan Kalter (Self - Announcer)
Late Show with David Letterman — S20E124
Episode: Joseph Gordon-Levitt; Keith Olbermann; Keith Urban
Air Date: 2013-09-11
Overview
From "Don Jon", director and actor Joseph Gordon-Levitt; talk show host Keith Olbermann; musical guest Keith Urban.