Sarcastic humor and witty dialogs still work perfectly.
But on a more personal note, sometimes things we love hurt like hell.
Regardless of how much I love it, I haven't rewatched this one for almost 8 years, because of how sad it makes me feel.
It's not like much has changed, although this time for rather different reasons.
In a way, Inadequate People reminds me of Chungking Express - only less poetic and far more grounded. Characters are as deep into their illusions, it's only that in this story they are actually aware of the impossibility of these illusions.
P.S. The second part comes out this year, which makes me both excited and scared - it might become a sort of Russian version of Before Sunrise/Sunset/Midnight, but it can just as well turn out to be the disappointment of the century. And I'm not sure I can take any more sadness from this story.