 Hammer met with the producers of the series in May 2011 to record his lines.American talk show host David Letterman also guest starred in "The D'oh-cial Network", appearing as himself in the couch gag in the "Simpsons" opening sequence at the beginning of the episode.The couch gag sees the Simpson family arriving in New York City to the tune of "Rhapsody in Blue" to be guests on "Late Show with David Letterman".