I have encountered two more bugs - when entering the Burger store and talking with the seller there, I got a quest to put 3 posters at unique buildings. Then, I suddenly could tell the seller that I have found some his friend in the sewers... Even when I was never there yet.
And in case of the seller in the starting market (who gives the quest to find the three rave posters and get into the sewers to the rave event), when repeatedly visiting and talking with her in following runs, I get there added same conversation option, asking her about what is playing at the radio.
And this reminds me one more bug - happened with the fairy drug seller - when I opened and closed the trade menu and then tried to re-open it by T, I wasn't able to do it again.