The red beach house used as the hideout was used several times during the course of the show and was even Rocky's first house (or a beach house he had rented for a vacation) in season one's Sleight of Hand (1975).
The building used as the Delman Hotel was used in five previous episodes as apartment buildings and a motel.
The often-used red house mentioned above was also seen often in Charlie's Angels, as Jill Munroe's house.
The license plate on the fetching Beth Davenport's Porsche is 427KQB
Joseph Della Sorte (Lucy Carbone) had previously played a similar underworld figure on season one's "This Case is Closed" (1974).