We learn that Helen Crump's phone number is 2389.
Sid Melton being cast as the studio public relations man would not be a surprise. He was a regular on Danny Thomas's show, who was a producer, and co-creator of the Griffith show.
This episode has a reminder of how small Mayberry is when Aunt Bee and Opie become excited about trying pizza for the first time. There is no Mexican food in Mayberry either, when in an earlier episode Andy has to explain to Opie what a tortilla is.
Andy seems to be overly cautious and awkward using Darlene's telephone until you consider that there are no dial phones in Mayberry. Sarah handles all of the calls.
Opie begrudgingly wears the red shirt/brown short outfit Aunt Bee picked out for him, and Andy, in the Off to Hollywood episode (Season 6 Episode 7).