Felicity Huffman (Lynette Scavo) & Justine Bateman (Ellie Leonard) also worked together on Out of Order (2003) as Lorna Colm & Annie respectively.
Karen McCluskey says: "...the next time 'Guiding Light' is on". Guiding Light (1952-2009) was an American radio and television soap opera.
Susan says (about Marisa): "So why don't you take your child bride, and find another class". In real-life, Teri Hatcher (Susan) is 11-years older than Sunny Mabrey (Marisa). Richard Burgi (Karl) is 17-years older than Mabrey.
The episode title "Opening Doors", comes from a song of the same name in the Stephen Sondheim musical, 'Merrily We Roll Along' (1981).
Gabrielle says (about Lee): "He looks like the lost member of Wham!". Wham! were an English pop duo, formed 1981, consisting of George Michael and Andrew Ridgeley.