This is Kelsey Grammer's favorite episode.
Diane uses the term POSSLQ, which is an acronym that stands for "person of opposite sex sharing living quarters." It was coined by the U.S. Census Bureau.
In later seasons there are jokes about Lilith not having a good singing voice. Here, Bebe Neuwirth sings in her natural (Broadway level) voice.
"Our House" was written by 70s superstar Graham Nash about a day in the life of his relationship with fellow musician Joni Mitchell.
Sam and Frazier smoke Macanudo cigars. A Macanudo a cigar brand produced by the General Cigar Company in the Dominican Republic. It is noted for its mild flavor and lite Connecticut shade wrapper.