The living room and patio/backyard of Alexandra's house is recognizable as being that of the Brady Bunch home. A few other "Mannix" episodes also used the Brady set.
Robert Sorrells who plays Clement North killed one person and wounded another man at a bar in Simi Valley, CA. He died in Vacaville prison.
The black and white Los Angeles police car seen in this episode, a 1969 Plymouth Belvedere, wears the same number roof lights (817) and shop number (80817) seen on the Belvedere that was used at the same time on Adam-12. It also wears accurate LAPD door sales and motto ("To Protect And To Serve") seen on actual units and on Adam-12. It seems likely that it is the same car as used on Adam-12.