Richard Crenna directed this episode (and several others). He's famous for his portrayal of Col. Trautman in the Rambo movie series.
The military recruiting center scenes mark one of the very few times that a black person appears on the show.
This is one of eight appearances in The Andy Griffith Show (1960) for actor Allan Melvin, playing a different character each time. He would later play another sergeant in another Mayberry Production, Gomer Pyle: U.S.M.C. (1964), as Sergeant Hacker, U.S.M.C.
For breakfast at the diner, Barney orders: orange juice, bowl of cereal, stack of wheats, three eggs-over (make sure they aren't too runny), bacon on the crisp side, white toast, butter, hash brown potatoes and coffee. Olive says, "It does my heart good to see a thin person eat."