1963
Act One
Robert E. Sherwood
1967
The Producers
Franz Liebkind
1969
Viva Max!
Dr. Sam Gillison
Butch Cassidy and the Sundance Kid
Marshal
The April Fools
Les Hopkins
1971
Desperate Characters
Otto Bentwood
1972
Second Chance
Doctor Julius Roth
What's Up, Doc?
Hugh Simon
1973
Steambath
Broker
Guess Who's Sleeping in My Bed?
Mitchell Bernard
1974
Hello Mother, Goodbye!
The Parallax View
Former FBI Agent Will
Young Frankenstein
Inspector Kemp
1975
It's a Bird...It's a Plane...It's Superman
Max Mencken
Someone I Touched
Paul Wrightwood
Night Moves
Nick
1978
Goin' Coconuts
Kruse
1979
Before and After
Ben Fryer
You Can't Take it With You
Mr. Kolenkhov
The Apple Dumpling Gang Rides Again
Woolly Bill Hitchcock
1981
Full Moon High
The Coach - Principal Cleveland
1982
The Rules of Marriage
Red Hewitt
1983
Yellowbeard
Mr. Crisp
Group Madness
Himself
1984
Protocol
Lou
1985
Prince Jack
Lyndon Johnson
Beer
A.J. Norbecker
Fletch
Stanton Boyd
1986
The Adventures of the American Rabbit
1987
Radio Days
Rabbi Baumel
1988
Top Cat and the Beverly Hills Cats
Director / Dogcatcher (voice)
For Keeps
Mr. Bobrucz
Illegally Yours
Hal B. Keeler
Rented Lips
Reverend Farrell
1989
Son of Dinosaurs
The Little Mermaid
King Triton (voice)
Get Smart, Again!
Cmdr. Drury
Police Academy 6: City Under Siege
Mayor
1991
Shadows and Fog
Magician
Mimi & Me
Uncle Al
1993
Sex, Shock & Censorship in the 90's
Reverend Pete
We're Back! A Dinosaur's Story
Professor Screweyes (voice)
1994
Thumbelina
King Colbert (voice)
The Land Before Time II: The Great Valley Adventure
Grandpa (voice)
1995
Rough Magic
Magician
The Land Before Time III: The Time of the Great Giving
Grandpa (voice)
1996
Making Frankensense of Young Frankenstein
Inspector Kemp (archive footage)
Citizen Ruth
Dr. Charlie Rollins
The Land Before Time IV: Journey Through the Mists
Grandpa (voice)
1997
The Land Before Time V: The Mysterious Island
Grandpa (voice)
1998
The Land Before Time VI: The Secret of Saurus Rock
Grandpa (voice)
2000
The Little Mermaid II: Return to the Sea
King Triton (voice)
The Land Before Time VII: The Stone of Cold Fire
Grandpa (voice)
Runaway Virus
Dr. Arnold Bowman
2001
The Land Before Time VIII: The Big Freeze
Grandpa / Lambeosaurus (voice)
2002
Teddy Bears' Picnic
Gene Molinari
The Land Before Time IX: Journey to Big Water
Grandpa (voice)
2003
The Land Before Time X: The Great Longneck Migration
Grandpa (voice)
2005
Disney Heroes Volume 1
Old Gorilla (voice)
The Land Before Time XI: Invasion of the Tinysauruses
Grandpa (voice)
2006
The Land Before Time: 2 DinoRiffic Adventures
Grandpa Longneck
The Land Before Time XII: The Great Day of the Flyers
Grandpa Longneck / Parasaurlophus (voice)
2018
The Making of 'The Producers'
Self
2019
The Little Mermaid Live!
King Triton (voice)