In this episode when Frasier is talking to Claire (Patricia Clarkson) at the table with the CD organizers you can see that Kelsey Grammer is wearing a wedding ring in some shots and in others is not.
Frasier (Kelsey Grammer) did not speak German as of episode 2.21, An Affair to Forget (1995). It is most likely this has been corrected as that earlier episode was inconsistent - since it is virtually required that any serious student of Freud should read him in the original German.
In earlier episodes, when Frasier first becomes reacquainted with Lana, her name is Lorna. Suddenly now her name is Lana.
Haiku are in a pattern of 5, 7, and 5 syllables. Claire's was 7,5,5. It would be correct if she paused before the word "upstream."