This game requires you to be good at talking. You can say something most benign and exit out of dialog completely, failing the quest in the process. There are diverging branches of dialog, and only rarely are you allowed to come back to hear everything what you wanted to hear. Alas, hearing everything requires even more save-scumming than usual.

All the dialogues trees have been extracted and uploaded here - https://pathologicdialogue.github.io/. Not posting them on steam directly, since there are a lot of them, and they are messy to navigate without javascript. They are separated into individual campaigns, and individual character pairs. Fully unwrapped and navigatable, but not necessarily in the chronological order between different encounters.

Available both in English and in Russian.