From the redecoration at the start of season six up until the eighth episode of season seven the thermostat had been located on the wall next to the brass ship's wheel. In order to support the word association gag in this episode, the thermostat vanished from the wall.
This marks the first time Frasier Crane dresses up as a clown. He did this again in the season 11 Frasier episode, "Boo!"
Although link=Sandahl Bergman plays Chelsea Noble's mother here - the two actresses are only 13 years apart in age. Sandahl Bergman is best known as having played the love interest in Conan the Barbarian (1982).
The episode title, "Send in the Crane," is a play-on-words of the song, "Send in the Clowns," written by Stephen Sondheim for the 1973 musical, "A Little Night Music." The "clowns" in the song symbolize people who say and/or do foolish things.