The house where Agatha Henderson lives was also LI Wing's house in the season 4 "A Matter of Mutual Concern" and Willard Allen's residence in the season 5 "The Diamond That Nobody Stole".
James Olson's character is seen in the beginning of the episode carrying a red, yellow, blue and green umbrella. It may not have been done deliberately, but that type of umbrella was seen frequently as a symbol in Patrick McGoohan's series of The Prisoner (1967) in 1967. The character portrayed by Olson plays an egotistical type who is always shouting harassment from the police. This is similar behavior pulled by the government ruling the village in The Prisoner, the leader of which (Number 2), is often seen standing close to, or carrying an umbrella which appears to be identical to the one carried by Olson in this episode.