I just remember this feeling "over the big pond" that I was standing in houses of people that I assumed to have a good income looking at things and thinking to myself "if I would buy this now, it wouldn't last me till retirement"...
Another memorable event was learning about the true American religion: Tide. I still cannot believe people seem to be addicted to a detergent that costs a small fortune per bottle. I kind of assume that the typical top loader washing machines aren't much more expensive than the detergent (here I have never seen one of these fake washing machines).
Another thing I remember is design. My father is a hobbyist wood carver and painter with an admiration for the romantic epoch up to the art of the 20ies I would say. I was raised in the firm belief, that a certain aestheticism was lost when artistic and design styles moved ahead. When I was in the US I had at one point an almost enlightenment. I - like many other exchange students - recognised how many things in the us are designed with ornaments, I am not speaking about old stuff things that are produced today. This starts with pens, book covers and furniture, over Greek style columns at family homes and hospitals, and I can only describe this weird feeling with what I assume to an American is the feeling when looking at stuff of Donald trunp. No clear lines but ornaments everywhere. Then I realised that the US has never completely said goodbye to art deco and related styles. Since I know now what the logical continuation of art deco in the 21st century is, j am much less inclined to join my father in mourning the arrival of modern design.
The most memorable part for me was the vast amounts of cupholders in American cars that aren't found in vehicles anywhere else in the world.