The film that Niles references in which a movie star let everyone look up her skirt is Basic Instinct (1992)
The only episode of the series where a sound can be heard during the end credits (other than the Tossed Salad and Scrambled Eggs theme). In this case, Frasier emerges from the hot tub gasping for air after holding his breath.
Frasier's denunciation of nuts as unhealthy junk food does reflect general medical consensus of the time. In later years, nuts came to be considered something of a 'super food,' boasting healthy unsaturated fats that lower cholesterol, high levels of fiber, protein, and various vitamins and minerals.