Late Night Hangs
A lot of places in the US are open 24 hours, so that way if you're out late with your friends, you can satisfy whatever post-midnight snack you want. In Europe, though it's custom to eat meals late, that doesn't mean that stores and restaurants will also be open for your 3 a.m. activities. Go to bed!
Huge Pickup Trucks
Don't mess with someone's 4 by 4. The bigger the wheels, the tougher the man (apparently). Americans love driving enormous pickup trucks, but in other countries, they're used primarily for work or moving jobs and not driven as an everyday car.