The radio personalities all seem to be voiced by Howard Morris, who directed this episode, and periodically appears on the show as the character, Ernest T. Bass.
Blue was the name of the dog in "No Time for Sergeants" owned by Andy's character.
Howard Morris is not only the radio voice on announcing the escape of Ralph Neal, he also the singing voice of Leonard Blush.
Actor James Seay plays a state trooper here. And in 1968, plays Captain Rogers, the fill-in sheriff of Mayberry, in an episode of Gomer Pyle USMC, where Gomer comes home and all the main characters are gone on vacation.