The whole episode takes place in one evening. Martin asks Niles early in the episode who Phyllis is and Daphne tells him it is a woman that Niles is in love with. However, later in the evening when Martin meets Phyllis, he tells her that Niles has been talking about her for an entire week.
Daphne demonstrates some knowledge of opera to Niles, explaining that after living with Frasier for five years, she's learned a lot about it. Yet, in season eight's 'Daphne Returns' (2001) she calls Niles a pretentious snob for liking opera and he retorts that she's never given it a chance.