Last show of the series.
According to this episode's closing credits, the members of the barbershop quartet, The Choral Roberts, with whom Andy Griffith sang as character Ben Matlock were: Robert "Robert" Cox (bass), Robert "Jim" Benson (baritone), Robert "Robbie" Benson (tenor), and Robert 'Bob' Appleton (lead).
In syndication, this episode was divided into two parts, episodes 15 and 16 of season 9.
This episode aired almost 3 years to the date of the last episode aired on NBC.