Frasier (Kelsey Grammer) mentions Lilith's (Bebe Neuwirth) affair with 'a Frenchman who lived in a self-contained underground eco-pod.' This was Dr. Louis Pascal (played by Peter Vogt), from the Cheers (1982) two-parter Teaching with the Enemy (1992) and The Girl in the Plastic Bubble (1992).
JoBeth Williams is the guest caller here, and would later appear in the next season episodes Adventures in Paradise: Part 1 (1994) and Adventures in Paradise: Part 2 (1994).
In the Cheers episode 7.9, Send in the Crane (1989), Frasier attends a children's party in Woody's place wherein he wears quick release suspenders. Unfortunately, Woody forgot to give him the oversized polka dot boxers. In this episode, Niles David Hyde Pierce mentions he is wearing quick release suspenders and oversized boxers.
This episode is the first to showcase the logistics of the studio sets used throughout the series. If the KACL set and Frasier's apartment were both used, and the Café Nervosa scenes were shot only in the little back corner by the bookshelves, it generally means that another large set was taking up too much room in the studio during that particular shoot. In this case the Anya's Restaurant set.
Pat Crowley, who plays Marion Lawler, starred from 1965 to 1967 as Joan Nash in the NBC sitcom "Please Don't Eat the Daisies."