Played Richard Dean Anderson's father in "Emerald Point N.A.S." (1983) even though he is only seventeen years older than him.
Recommended his college friend, James Coburn, for his break-through role in The Magnificent Seven (1960). Desperate to cast the movie before an impending actors' strike, director John Sturges was open to Vaughn's suggesting the relatively unknown actor.
The California Democratic Party originally wanted him to challenge Ronald Reagan for Governor. Even though Vaughn is a liberal Democrat, and disliked Reagan, he refused and instead stood behind Governor Brown, who lost the election to Reagan. Another possible candidate considered was Gregory Peck.
The only actor who has been in both The Magnificent Seven movie and the TV series.
Was a close friend of Robert F. Kennedy and Joyce Jameson.
Was one of the first actors to play the same character (Napoleon Solo) on three different television series: "The Man from U.N.C.L.E." (1964), "Please Don't Eat the Daisies" (1965) and "The Girl from U.N.C.L.E." (1966).