This was the second of three guest appearances Robert Logan made (all in different roles) before joining the cast in the fourth season as J.R.
John Dehner's character is obviously a caricature of Elvis Presley's manager Col. Tom Parker, complete with phony Southern accent, cowboy hat, checkered vest and constant referring to his star as "my boy" or "the boy."
The episode title is an oblique reference to the fact that Billy can no longer hit an E flat.