Michael Keaton

Character: Johnny Dangerously

Joe Piscopo

Character: Vermin

Marilu Henner

Character: Lil

Maureen Stapleton

Character: Mom

Peter Boyle

Character: Dundee

Griffin Dunne

Character: Tommy

Glynnis O'Connor

Character: Sally

Dom DeLuise

Character: The Pope

Richard Dimitri

Character: Maroni

Danny DeVito

Character: Burr

Ron Carey

Character: Pat

Ray Walston

Character: Vendor

Dick Butkus

Character: Arthur

Byron Thames

Character: Young Johnny

Sudie Bond

Character: Cleaning Lady

Alan Hale Jr.

Character: Desk Sergeant

Scott Thomson

Character: Charley

Carl Gottlieb

Character: Dr. Magnus

Neal Israel

Character: Dr. Zillman

Mark Jantzen

Character: Dutch

Hal Riddle

Character: Warden

Mike Bacarella

Character: Vito

Gary Watkins

Character: Manny

Hank Garrett

Character: Mayor

Leonard Termo

Character: Tony Scarano

Troy Slaten

Character: Young Tommy

Alexander Hertzberg

Character: Boy in Suit

Georg Olden

Character: Young Vermin

Cynthia Szigeti

Character: Mrs. Capone

Elizabeth Arlen

Character: Girl on Steps

Doris Grossman

Character: Woman

Richard Warwick

Character: Prisoner

Mike Finneran

Character: Prisoner

Paul B. Brice

Character: Prisoner

Will Seltzer

Character: Prisoner

Dick Balduzzi

Character: Prisoner

Gordon Zimmerman

Character: Prisoner

Katie La Bourdette

Character: Blond Girl

Norman Steinberg

Character: Reporter Duffy

Frank Slaten

Character: Henchman

Dean R. Miller

Character: Photographer

Edward C. Short

Character: Porter

Shelley Pogoda

Character: Woman

Jerome Michaels

Character: Reporter Diering

Russell Forte

Character: Hood

Jack Nance

Character: Priest

Joy Michael

Character: Chorus Girl

Rick Rosenthal

Character: Judge

Paula Dell

Character: Mrs. Zimmer

Harvey Parry

Character: Policeman

Jeffrey Weissman

Character: T-Shirt Vendor

Richard A. Roth

Character: Prisoner Rabbi

Chuck Hicks

Character: Governor

Bob Eubanks

Character: M.C.

Claudia Kim

Character: Girl

Trisha Long

Character: Female Butler

Mert Rich

Character: Man

Vincent Schiavelli

Character: Maroni's Building Planner (uncredited)

Taylor Negron

Character: Delivery Man (uncredited)

Joe Flaherty

Character: Death Row Inmate (uncredited)

Hank Robinson

Character: Policeman (uncredited)

Susan Lanier

Character: Radio Singer (uncredited)

Frank Sivero

Character: Plumber (uncredited)

Tom Willett

Character: Theater Patron (uncredited)