The adult bookstore location at 4877 Lankershim Blvd, North Hollywood, California, USA where Fitch and Rockford chat with old Rosie is still an Adult themed Store, 18+.
Issac Hayes, born 1942, plays Gandolph Fitch, who is revealed to be the father of another character, Debbie Bingham, played by Annazette Chase, born in 1941.
Voice on telephone message is Jackie Cooper. He also left a message in season 1 ("Counter Gambit" which he directed) about owing Jim money. He directed 5 Rockford episodes and appeared in 2 others. Starting in 1929 he was one of the early "Little Rascals". In 1931 at age 9 he was nominated for an Oscar.