In this dialogue based game - it is not recommended to skip any dialogues since the clues (triggers) are in there. I ended up rehashing all the dialogues. It can be trying. Oh yes.
I really do not know a foolproof way. Since, sometimes when I'm done - I go back immediately and starts a new dialogue with the same person and new subject matter comes up.
As for the exits, I found that H later in the game.
I kept on going back and forth on each screen.
The storyline is very good and interesting though. That might get you through.