- He made guest appearances on both The Twilight Zone (1959) and The Twilight Zone (1985).
- He was a close friend of Gregory Peck and Kenneth Tobey.
- Enrolled at the United States Naval Academy in 1937 as a Midshipman. Sometime between 1939 and 1940, he left the Academy due to temporary vision problems, but later, during World War II, flew as pilot in the Army Air Corps in Europe.
- In his youth, he was frequently mistaken for and misidentified as Laurence Harvey, given their strong resemblance to each other.
- Attended the 2007 Twilight Zone Convention at the Hilton Hasbrouck Heights, Hasbrouck Heights, New Jersey, August 4-5, 2007.
- In 2008, he was honored at the 44th. Cinecon Film Festival. He received their Society for Cinephiles Career Achievement Award at a banquet held at the Hollywood and Highland Renaissance Hotel in Hollywood, California. Actress Doris Roberts presented him with his award. Earlier in the day, Warren attended a screening at the Egyptian Theater of The Case Against Brooklyn, followed by an interview in which he talked of his entire life both on and off the screen.
- Member of the Academy of Motion Picture Arts and Sciences [Actors Branch].
- Attended Lone Pine Film Festival, Lone Pine, California, October 10-12, 2008.
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