Less common are understanding of legal issues, typically common law needs at least one case to clarify an issue as opposed to positive law countries; the right to bear arms is a big one, so is American-style freedom-of-speech.
More specific are things like: non-American universities provide a good education, non-American companies can innovate meaningfully, tipping is omnipresent in services, keyboard layouts, American references in literature, sport, movies, etc.
One of the latest obvious examples of such mindcuffs outside of HN is Apple’s announcement around battery replacement: it’s impossible to find conditions that are not meant for the US market. You can redirect the offer to local stores or find it there. That is actually quite typical of Apple, in spite of 60% of their sales being outside of the US.
I have made the mistake to point at similar mindcuffs on HN and I will not do it again.
Also aren't political views geographicaly tied?
The SV way of thinking is present to some extent in most urban people of similiar socioeconomic class. A plumber from SF will not necessarily take the same things for granted that a programmer from SF will.