- Appeared in the first episode of Sanford and Son (1972).
- Friends with Katherine Helmond and Gordon Jump.
- Arthur Peterson, who played Mandan's character's father-in-law on Soap (1977) was born in Mandan, North Dakota.
- Mandan appeared onstage in 1998 in Los Angeles in AfterPlay, written by Anne Meara. In February 2005, Mandan starred onstage as Davies in Harold Pinter's play "The Caretaker" at the Zephyr Theater in Los Angeles, for which he received that year's Ovation and LA Weekly awards for his performance.
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