Frasier mentions going shopping for clothing at Louis. Louis was in fact a trend setting luxury clothing shop in Boston located on Newbury St for decades catering to Boston's elite. It survived for 86 years until it finally closed in 2015.
At this point Kelsey Grammer was still a guest actor rather than a full cast member. Grammer's performance of Frasier's "menage à boobs" rant is credited with cementing his role as a regular.
Diane's recreational reading: Nicholas Nickleby by Charles Dickens. In 1982 a successful British stage production of Nicholas Nickleby was a hit on PBS and introduced US audiences to Roger Rees, who later played Robin Colcord on Cheers.