All of the title cards ("The Icewoman Cometh", "Strange Interlude", and "Long Night's Journey Into Day") are references to Eugene O'Neill plays. Frasier (Kelsey Grammer) also likens Niles (David Hyde Pierce) and himself to characters in an O'Neill play.
The celebrity caller in this episode is Halle Berry (Betsy), whose husband wants to take her on an anniversary cruise, but she has recurring nightmares about being shipwrecked.
It won an Emmy Award for Outstanding Editing for a Series.
Frasier's undressing to make love with Lilith while still wearing his socks is an homage to early porn films where the male stars wear nothing but their socks. There are different theories on this phenomena, but it is a continuing source of humor in plays and film productions.
This one focuses largely on Frasier, Lillith (who is a guest here) and Niles. Martin, Daphne and Roz appear only in one scene (the former two share one scene), and they are neither seen nor mentioned once the hotel scenes begin.