Why fuck up at this late date? Purity of execution will only add to the artistic aspects of the whole wretched mess.
Another foreshadowing of his settled plan. Not sure why generic vodka over polish vodka will fuck it up. I would guess this is because Polish vodka, made from grain, is so much better than generic potato vodka. The idea that he executes his plan to drink himself to death perfectly adds in his mind to its artistry. Perhaps he is an artist? A writer? This may be the only clue to that assumption the movie made - this and he lives in Venice.
