Inspired by the 5/4/1970 shootings on the campus of Kent State University in Ohio.
Actors John Randolph (Governor Keller) and Noam Pitlik (Frank Bettencourt) both went on to play recurring roles on The Bob Newhart Show (1972). Randolph as Emily's father Junior Harrison, and Pitlik as Bob's neurotic patient Victor Gianelli.
Hal Holbrook (Hays Stowe) and John Randolph (Governor) also appear together in Lincoln (1974). Holbrook stars as President Lincoln and Randolph plays Secretary of War Simon Cameron.
Bernie Hamilton (Dr. Benjamin Edwards) also appeared in the series pilot A Clear and Present Danger (1970). He played a different character, House, an AG office flak.