After Dr. Myshkin leaves, the beautifully-bound diary of Princess Sonja Romanoff is still lying on Frasier's coffee table. Dr. Myshkin said that it was a "copy" and therefore may have been meant as a gift for Frasier, but that point is never made.
Daphne: Wow, I don't see the three of you watching the same show very often. What's going on? Pavarotti jumping the Grand Canyon?
The Crane Men share a bonding experience over the televion show "The Antiques Roadshow", they play a drinking game similar to "Hi Bob" where they take a drink everytime someone on the show utters the word "veneer".
Martin says the first place he wants to go in the Winnebago is Elmo, Nebraska. There is no such place.
Dr. Myshkin refers to "Princess Sonja Romanoff". There was an actress named Sonja Romanoff who worked in European films during the 60's.
The episode title, "A Tsar Is Born" is borrowed from the 1937 film, "A Star Is Born" starring Janet Gaynor (remade in 1954 with Judy Garland and 1976 with Barbra Streisand). Even "Tsar", the Russian spelling of "Czar", is an anagram of "Star".