This is the last appearance of John Masters - Mayberry Choir Director and part time clerk at the Mayberry Hotel.
The pageant featured in this episode is referred to as a Centennial Pageant to celebrate Mayberry's first 100 years. However, based on the content of the pageant itself and numerous other reference to Mayberry's role in both the American Civil War and the Revolutionary War, Mayberry was clearly founded in the 1700's which would have made the pageant a Bicentennial Pageant.
Barney says in reference to Aunt Bee's acting attempts "Not even Tex Ritter got it right at the bat". Tex Ritter, the famous singing cowboy, was the father of John Ritter, who Don Knotts eventually co-starred with in Three's Company.