I think only now am I really getting the reverse culture shock I kept bracing myself for after returning from Sweden. It's not just missing things that made life fun, like the nations (I would kill for a night at the nations, even V-Dala club nights) it's seeing things that are odd in comparison and being reminded of little quirks.
One of the things I think is really bizarre is that when I was at the U of A freshman year, I noticed there were some foreigners, mostly Asian and a few from Africa, but for the most part it was hard to find someone who wasn't American. When I went to Uppsala I was amazed by how many exchange students there were. I'm aware that as an exchange student I was in classes with other foreigners or was in other activities designed with exchange students in mind, but even putting all that aside there still seemed to be more international students than at the U of A. Now I'm back and it seems like while I was gone the number of international students increased tremendously. I'm not sure if I just wasn't actively looking before or if I'm just in the right type of classes; maybe the Theater department wasn't the most popular venue for foreigners.
Another thing I noticed while I was in Uppsala, while there were plenty of exchange students and a fair number of immigrants, the general appearance of the population was pretty homogeneous. Even fashions and hairstyles were pretty uniform, I remember being rather disenchanted with that discovery. But at the U of A there's a paradox; I see the rich ethnic diversity, blending of different peoples, countless subcultures, people of all shapes and sizes. Then I see the sorority girls, all with bug-eye sunglasses, bleach blonde hair, fake tans, and shorts with their sorority written on the ass. They're everywhere and they're all exactly the same. Even their speech and mannerisms are identical; it kinda creeped me out that it seems I see one of the sorority girls I met in Uppsala everywhere here.
I also got in touch with a couple of exchange students from Uppsala that are at the U of A. It's really fun and surreal to be able to talk about Uppsala with someone while they're in Tucson. It's funny, I asked them why they came here of all places and they said it was to get away from the cold. They couldn't imagine why I would leave Tucson to seek out icy weather in Sweden. I also can keep up my Swedish by talking to them; it's embarrassing that I've already started to forget simple words. On the other hand, as a habit for familiarizing myself with the language I would insert Swedish words or phrases in an English conversation with a Swede. I had to wean myself off that habit when I got back to the US since no one would know what the hell I was talking about. But since I met the Swedes it's been popping up every now and then. The other day at work I didn't hear what someone said and instead of saying "What?" I said, "Vad sade du?"

And not really anything new, but I think it's interesting that the English words 'ken', 'canny', 'know' and the Swedish 'känna' are all from the same Germanic word. I was kind of disappointed to not find a link between 'sense' and 'känna' though; they sound similar enough and they do have overlapping meanings.