- Was in three Best Picture nominees: Twelve O'Clock High (1949), All About Eve (1950), and Elmer Gantry (1960), with All About Eve winning in 1950.
- When Marlowe left his job as a radio announcer at WHO in Des Moines, he was replaced by another future film actor - Ronald Reagan.
- A former radio announcer, he began his acting career at the Pasadena Playhouse in the early 1930s. He worked at 20th Century Fox as a second lead in the 1950s and reprised his former radio role in Mystery Is My Business (1954).
- He has appeared in four films that have been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: Meet Me in St. Louis (1944), Twelve O'Clock High (1949), All About Eve (1950), and The Day the Earth Stood Still (1951).
- Is one of twelve actors who played the trifecta - the victim, the defendant, and the murderer - in various episodes of Perry Mason (1957).
- Ex-son-in-law of Sam Wood.
- Ex-brother-in-law of Jeane Wood and Joe Sawyer.
- Often confused with actor Richard Carlson.
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