People are generally more gregarious and community focused. Completely happy to share a room with a complete stranger at uni, have 'study groups,' instead of just revising on your own, every one in your town, local bar and coffee shop, knows your name, if in school you belong to a clearly defined 'group' (theatre kids, cheerleaders), etc., whole town actually gives a shit about the local school's sport fixtures and turns out to things like bake sales (?). Instead of spending time at home when not at work you spend all your time at said local bar or coffee shop.
If you are an introvert (different form not being popular) it is your most obvious characteristic, v. unusual, and possibly indicative of your disturbed mental state.
In addition to 'homes being huge,' teeny tiny towns have the most amazing facilities. Thinking of Sunnydale which was introduced as a tiny nowheresville, and over the course of 7 years had 13 graveyards, multiple churches, a hospital, several universities, a dock, mall, club, airport (!)...
All pupils sit on their own individual desks.
It's really easy for anyone to get a fake I.D. Even the wildest people when I was young would have no idea how to get a realistic looking driver's license or similar in the UK! If Americans do get busted for being underage, everyone only cares about the drinking, not forgery of important documents!