Film
- 1988 Monkey Shines as Dean Burbage
- 1990 Ghost as Police Sgt.
- 1992 A Woman Scorned The Betty Broderick Story as Kevin McDonald
- 1992 Buffy the Vampire Slayer as Gary Murray
- 1993 Dave as Don Durenberger
- 1993 RoboCop 3 as Coontz
- 1998 Krippendorf's Tribe as Gerald Adams
- 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 DodgeBall: A True Underdog Story as Gordon
- 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 Imagine That as Fred Franklin
- 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
- 2018 The Ballad of Buster Scruggs as the Bank Teller
- 2020 The Empty Man as Arthur Parsons
- 2021 The Tragedy of Macbeth as the Porter
- 2022 To Leslie as Dutch
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 Teen Titans as Val-Yor
- 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 Louie as Dentist
- 2010–2014 Justified as Judge Mike Reardon
- 2010–2011 Batman: The Brave and the Bold as Oswald Cobblepot/The Penguin
- 2011 Fringe as Raymond
- 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
- 2014–2015 Phineas and Ferb as Floyd
- 2015 Brooklyn Nine-Nine as Lynn Boyle
- 2016–2019 The Man in the High Castle as Hawthorne Abendsen
- 2018–2023 Barry as Monroe Fuches
- 2019–2022 Amphibia as Mayor Toadstool
- 2020 DuckTales as J.W. Guidebook
- 2020 The Midnight Gospel as Blithfreyus
- 2020 Perry Mason as DA Barnes
- 2022 The Legend of Vox Machina as Professor Anders
- 2023 Scott Pilgrim Takes Off as the Nanomachines
