- Played Dobie Gillis' brother Davey on a few episodes of brother Dwayne Hickman's comedy series The Many Loves of Dobie Gillis (1959).
- With the death of Shirley Mills on March 31, 2010, he is the last surviving cast member of The Grapes of Wrath (1940).
- Studied for four years at Loyola University before going into the service during the Korean War.
- During his off-time while on military duty, he discovered the writings of the great Russian teacher Konstantin Stanislavski. He later studied at the Actors Studio but broke away and formed his own teaching style called "The Process". He published the acting book "The Unconscious Actor - Out of Control In Full Command", which he considers a Zen-like acting guide for the 21st century.
- Older brother of actor Dwayne Hickman. (The two appeared together in Captain Eddie (1945) and The Happy Years (1950)).
- Once intended on becoming a Passionist monk in St. Louis before realizing it was not for him.
- Appeared in three movies nominated for the Best Picture Oscar: The Grapes of Wrath (1940), The Human Comedy (1943) and Network (1976).
- Brother-in-law of actress Joan Roberts.
- He is the son of Kathrine Louise (Ostertag) and Milton Lewis Hickman, Jr. He is of Swedish, German, English, and Scots-Irish descent.
- His maternal grandfather, Louis Henry Ostertag, was a US Navy seaman on Commodore George Dewey's USS Olympia, and present at the Battle of Manila Bay on May 1, 1898, for which he was awarded the "Dewey Medal" by Act of Congress. Per the 1940 Census, Darryl and his family were living with his grandparents at 950 Kenmore St., in Los Angeles.
- Ex-brother-in-law of Carol Christensen.
- Ex-son-in-law of Verna Hillie and Frank Gill Jr..
- With the death of Dwayne Hickman on January 9th 2022, he along with Tuesday Weld and Sheila Kuehl are the only living cast members of The Many Loves of Dobie Gillis (1959).
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