- Son of Robert Mitchum and Dorothy Mitchum
- Father of Bentley Mitchum and Carrie Mitchum
- Brother of James Mitchum and Trina Mitchum
- Grandfather of Cappy Van Dien and Grace Van Dien
- Claimed in an interview in 2019 that he was "blackballed" in Hollywood for several years for just knowing and appearing in a few of John Wayne's films.
- Nephew of John Mitchum and Julie Mitchum
- The Italian Production Chart section of" Variety", 7/9/80, announced filming was to start on 8/18/80, of "Marimba" to be directed by Wes Craven, with a cast that included Mithum, Dirk Benedict, and Tim McIntire, to be filmed in Colombia and the US. There is no evidence the film was ever completed or released.
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