Howard mentions how he used to date Millie, but they both realized it would never work out long term. In fact, they were engaged to get married in season 8, episode 12 on The Andy Griffith Show, "Howard and Millie." They started dating in season 8, episode 6 "Howard's Main Event." On The Andy Griffith Show, Millie's last name was Hutchins.
Stefanianna Christopherson that plays 'Dorothy' in this episode is better known as the voice of 'Daphne' for the Scooby-Doo series.