El Gabacho
Father Knickerbocker
Dr. Hephaestus
1st Supreme Court Justice
Old Sam
Sam Jaffe - Party guest (uncredited)
Bookman
Abe Stillman
Mr. Berryman
Old Whateley
Bleum
Brother Lilac Bailey (art forger)
Père Joseph
Dr. Singleton
Technical Adviser (Shrink)
Simonides
Henry Heusken
Sam Cooper
Self (uncredited)
Prof. Jacob Barnhardt
Sam Cooper
Samuel Gower
Doc Erwin Riedenschneider
Dr. Francis Kittridge Hunter
Dr. Romley
Professor Fred Lieberman
Mayor Galimard
Sam Jaffe
Gunga Din
High Lama
Gregory Simonson
Grand Duke Peter