The officer inside the victims apartment identified himself as unit 1A-12 (1-Adam-12). This probably wasn't a coincidence as preproduction on the series would've begun by this time.
Ralph Moody was 80; his character, Lou Adams, was 62.
Sergeant Friday (Jack Webb), Officer Gannon (Harry Morgan), and Officer Miller (Merry Anders) travel to Cottonwood, Arizona to interview and extradite the suspects. Cottonwood is an actual town in Yavapai County, Arizona. In 1967 Cottonwood had a population around 2,300 people and had grown to 12,200 by the year 2020.
Jill Banner and Ben Morris, together in the Cottonwood Police Department scene in this episode, both died in August 1982, she on the 7th and he on the 18th.