Film
- 1990 Ghost as Police Sgt.
- 1992 Buffy the Vampire Slayer as Gary Murray
- 1993 Dave as Don Durenberger
- 1993 Robocop 3 as Coontz
- 1999 Office Space as Milton Waddams
- 1999 Bicentennial Man as Dennis Mansky
- 2000 O Brother, Where Art Thou? as Radio Station Man
- 2002 Ice Age as Frank
- 2003 Finding Nemo as Bubbles
- 2004 The Ladykillers as Fernand Gudge
- 2004 Jersey Girl as Greenie
- 2006 Ice Age The Meltdown as Aardvark Dad
- 2006 Idiocracy as Judge Hank "The Hangman" BMW
- 2007 No Country for Old Men as Man who hires Wells
- 2009 The Men Who Stare at Goats as Gus Lacey
- 2011 Rango as Doc and Merrimack
- 2011 Red State as Sheriff Wynan
- 2011 J. Edgar as Arthur Koehler
- 2013 The Lone Ranger as Habberman
- 2014 Selma as Al Lingo
- 2015 Trumbo as Hymie King
- 2016 Finding Dory as Bubbles
- 2016 Mike and Dave Need Wedding Dates as Burt Stangle
- 2017 Get Out! as Jim Hudson
Television Roles
- 1991 Star Trek: The Next Generation as Captain K'Vada
- 1995–1999 NewsRadio as Jimmy James
- 1997–2010 King of the Hill as Bill Dauterive, Buck Strickland and various others (uncredited for the first 3 seasons)
- 2002 Malcolm in the Middle as John Pratt
- 2002-2005 Kim Possible as Various characters
- 2004-2007 Tripping the Rift as Chode
- 2005-2006 The West Wing as Bob Mayer
- 2005-2007 American Dad! as Dick / Dentist's Father
- 2008 Pushing Daisies as Dwight Dixon
- 2008-2009 True Blood as Eddie
- 2010 24 as Bill Prady
- 2010–2011 Batman: The Brave and the Bold as Oswald Cobblepot/The Penguin
- 2010-2014 Justified as Judge Mike Reardon
- 2011-2017 Adventure Time as The Royal Tart Toter, Grimby, Martin
- 2012-2014 Dragons: Riders of Berk as Mildew
- 2012-2013 Boardwalk Empire as Gaston Means
- 2012-2016 Gravity Falls as Bud Gleeful
- 2014-2015 TURN: Washington's Spies as Nathaniel Sackett
- 2015 Brooklyn Nine-Nine as Lynn Boyle
- 2016 The Man in the High Castle as Hawthorne Abendsen
- 2018 Barry as Monroe Fuches
- 2019 Amphibia as Mayor Toadstool
