We learn that Cannon's wife was named Laura and his son was named David.
Connections to The Fugitive (1963) also a Quinn Martin production: William Conrad, narrator of every Fugitive episode, confronts the man who killed his wife, unintentionally, and fled. In The Fugitive, the title character likewise confronts the man who unintentionally killed his wife and fled. And, both events took place in 1961. This episode also has at least four actors (in addition to William Conrad) who appeared in The Fugitive, some more than once: Elizabeth Allen, Harry Townes, Sidney Clute, John McLiam and Joe DeSantis.
Actor Harry Townes' character Steve is Frank Cannon's former father in law. In real life Townes was only six years older than William Conrad.