Use of color
Maybe I imagined it, but I felt like the colors inside Göran and Sven's house were quite drab and understated, while in the sequences showing the neighborhood, all the houses were painted bright colors, people wore bright clothing... almost too bright, to the point of being cartoonish. This reflected in the red jogging suits, too, as though Göran went jogging just to try to seem acceptable. Of course, this made everyone else look somewhat artificial, which they mostly were. If the director made this choice consciously, then I have to say it's a most unsubtle attempt at taking a jab at heterosexuals I've seen in a long time. :)