- Adopted his stage surname from Foster Avenue in Brooklyn. His Russian-immigrant parents had previously changed their name from Vishnodosky to Feldman.
- Fervently supported the Brooklyn Dodgers, but never forgave the team for moving to Los Angeles.
- Honored with a plaque on the Celebrity Path at Brooklyn Botanic Garden.
- Joked that the only two steady jobs in his career were "Laverne & Shirley and World War II."
- Daniel Foster — Son
- Michael Foster — Son
- Attended New Theater School, New York, New York, United States
- Birth Name: Fivel Feldman
- Birth Place: New York, New York, United States
- Died: July 8, 1985
- Profession: Actor, Comedian
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Can the Time After Time stars, who were nearly unrecognizable with facial hair, recognize other actors by only seeing their facial hair?