The crop duster plane (N56416) is a 1941 Boeing Stearman Model 75 (A75N1 s/n 75-914). It is still airworthy and flying in Northern California.
In this episode, Mannix served as a Naval aviator in Korea. But in previous episodes he was an infrantyman in Korea.
Last of four appearances in the series by Linda Marsh.
Paul Mantee plays Dave Winters, a fellow pilot with Mannix during the Korean War. In A Ticket to the Eclipse (1970), Mantee played Tommy Gantt, a different Korean War buddy of Joe's.