The title is based upon a quote from William Shakespeare's Romeo and Juliet: "Good night, good night! Parting is such sweet sorrow, That I shall say good night till it be morrow."
The musical group in this episode is the The Shindogs, the house band from the TV show Shindig! (1964)
Patty Duke sings "Tiny Little Butterflies," written by Bernice Ross, Lor Crane and Jack Gold, which she sings in her movie Billie (1965), but this time with The Shindogs (as stated above) that included at various times Glen Campbell, Joey Cooper, Chuck Blackwell (drums), Billy Preston, James Burton, Delaney Bramlett, Larry Knechtel (on bass) and pianist Leon Russell.
James Burton, the uncredited Lead Guitarist for the The Shindogs, was inducted into the Rock and Roll Hall of Fame in 2011.