Cast and credits of Cracking Up

Fred Willard
Mr. Hardon / Mr. Willard-Office Personnel Worker / Danny the Diner Owner

Harry Shearer
Tom / Terry Lufts (as The Credibility Gap)

Michael McKean
Dr. Edward O'Mazuraski (as The Credibility Gap)

David L. Lander
Carl Adler / Alistair Kakowski / Mr. Hickenlooper (as The Credibility Gap)

Tino Insana
The Mailman

Phil Proctor
Walter Concrete

Bob McClurg
Ramblin'Ralph / Nick Jackelson / John E. Pluribus Unum Johnson (as 'Kansas City' Bob McClurg)

Leslie Ackerman

Neal Israel
Al

Edie McClurg
Sister Simple / Cowboy Girl in Bathroom

Mary McCusker
Chris's Girlfriend

Ron Prince

Lynne Marie Stewart
Kiamoka Wang

Stephen Stucker
Bruce 'Tushy' Smith

Fee Waybill
Professor Ceedee

Prairie Prince
(as The Tubes)

The Tubes
Themselves

Joe Roth
Weed Dealer (uncredited)

Paul Willson
Coach Bender (uncredited)