Name	Known for
David Letterman Self - Host Self - Host See fewer	Late Show with David Letterman (1993)
Katie Holmes Self - Guest Self - Guest See fewer	Batman Begins (2005)
Frank Caliendo Self - Guest Self - Guest See fewer	The Comebacks (2007)
Maroon 5 Themselves - Musical Guest Themselves - Musical Guest See fewer	Love Actually (2003)
Paul Shaffer Self - Musical Director Self - Musical Director See fewer	Hercules (1997)
Adam Levine Self - Guest Self - Guest See fewer	Begin Again (II) (2013)
James Valentine Self Self See fewer	Love Actually (2003)
Pat Farmer Self - Stagehand Bringing in Pizza for Three Guys in Audience (uncredited) Self - Stagehand Bringing in Pizza for Three Guys in Audience (uncredited) See fewer	Ed (2000)
Barbara Gaines Self - Executive Producer (uncredited) Self - Executive Producer (uncredited) See fewer	Late Show with David Letterman (1993)
Alan Kalter Self - Announcer / Scratching a Lottery Ticket (uncredited) Self - Announcer / Scratching a Lottery Ticket (uncredited) See fewer	Commander USA's Groovie Movies (1985)
Tony Mendez Self - Cue Card Boy (uncredited) Self - Cue Card Boy (uncredited) See fewer	Late Show with David Letterman (1993)
Al Norwood Self - Boom Operator (uncredited) Self - Boom Operator (uncredited) See fewer	As the World Turns (1956)