This episode was actually postponed and aired 5.4.66.
This is the sixth of six credited appearances Robyn Millan makes in the series, each time playing Roz, a schoolmate for Patty and Cathy.
This is the third of three appearances Kathy Garver makes in the series, always playing Monica Robinson. She is perhaps best known for her recurring role as Cissy in the family TV sitcom Family Affair (1966), which began airing in the fall of 1966, just a few months after this, her last, appearance in this series.
Richard mentions going to see a James Bond movie, an allusion to Thunderball (1965), which was released to theaters in December 1965 and would still be playing by the time this episode should have been originally aired, i.e. 16 March 1966.
Although this show was slated to be episode 28 and originally broadcast on 16 March 1966, it was preempted by the television network coverage of the Gemini VIII spacecraft's docking maneuver. This maneuver was a first for the NASA space program or any space program, for that matter, hence the public interest and historical significance of the TV coverage. This episode was, consequently, rescheduled for 4 May 1966, making it the final episode broadcast in the series lineup.