I've not lived in the US, but in Canada, grocery store bags are plastic, and have handles. And the people who work in the grocery store pack your bags for you ... sometimes well, sometimes badly, but at least they do it!
I think you can still get paper bags in some places, and they tend not to have handles, as they'd just tear. But I think paper bags are more of a tv + film thing than a reality thing, iyswim.
I'm not a fan of sweet things for breakfast, but they are quite common in North America. I stayed in a B+B once where the breakfast was v tasty but sent me into a diabetic coma ... waffles, fruit, syrup, whipped cream (fake with sugar in), and I think there were muffins too? It was scary.
I don't know the history of the sides-of-the-road thing, but I think you'll find Americans actually drive on the right side of the road! (ha ha ha Seriously, I think it has something to do with Napoleon or swords or something. Only the UK, Japan, and maybe Australia drive on the left, it's not really v popular at all)
I dunno about the gaps in loos. I had to stop DS1 from peering through them at people when we were in Canada this summer . What is an ass gasket? Do you mean those plastic covers? Most US women (I think?) either hover, or cover the toilet seat with toilet paper, if there are no plastic covers.
The furry cisterns are just to make it look less toilety I guess? I never had one.
I like open plan houses, I live in one (in the UK!). I hate the "tiny little rooms all over the place" style so popular here.
Oh, and I don't know what those tiny weird taps are for, other than burning children. Never had one.