Longtime producers David Angell, Peter Casey, and David Lee would leave "Cheers" after this episode and make farewell cameo appearances as patrons at the bar (seated next to Norm) in the cold open. The trio went on to create "Wings" and "Frasier" and would return to write a single episode of "Cheers" in its final season.
Originally, the song "You've Lost That Lovin' Feelin' by the Righteous Brothers is the song that is played to turn Rebecca's knees to butter. Rebecca's mother told Sam in a phone call and Sam even repeated this information to the bar. In syndication however, this Righteous Brother's song is replaced with "Unchained Melody."
It's implied that Cliff is a virgin.