In Episode 3 of Season 4 ("Open House"), Marie is wandering around a house looking at spoons. The realtor spots her and then the following conversation happens:
REALTOR: Hi. Can I answer any questions?
MARIE: Oh! Spoons...
REALTOR: Yes, the owner is quite the collector. Aren't they something? One for each of the 50 states.
MARIE: Well... Puerto Rico is technically a territory.
REALTOR: (surprised) Huh!
MARIE: You know, maybe they were thinking, "some day!".
I know it's an extremely minor thing, and the conversation itself is meaningless within the scope of the whole show, but can anyone explain to me what happened here?
What point is Marie making? Why is the Realtor surprised? I'm pretty sure everyone knows that Puerto Rico isn't a state(!), so what's going on?