The amount of whiskey in Roz's glass drops before she has a chance to take a sip of it.
The art books on top of Frasier's credenza, which stand there through 11 seasons, are upside down in this episode.
When Frasier and Luke are getting to know each other, Frasier mentions that he rowed crew at Harvard. Luke responds excitedly by saying he also went to Harvard. Normally in this situation, a fellow college grad would enthusiastically ask, "What year?' (meaning which year did they graduate). But Frasier simply says, "Ah, Harvard."