The photograph of Charles Hartney, the city councilor who Lou's investigating, is of Grant Tinker, who was Mary Tyler Moore's real-life husband at the time, and head of MTM Productions.
Charlene mentions in passing to Mary, her dating Frank Sinatra. Sheree North did, in fact work with Sinatra, on-screen, in an episode of The Colgate Comedy Hour, "Anything Goes."
Mary Tyler Moore, Edward Asner, and Robert Emhardt had all appeared in the movie, Change of Habit (1969). In that film, Asner plays the cop who arrests the local crime boss, played by Emhardt.