Say if I had to overwrite the save file using chapter select to get back to the beginning of a chapter because I missed something do conversations carry over like weapons etc do as well?
I'm pretty sure they do, since every other "collectible" (like Shiv Doors, Firefly Pendants etc.) carry over too. I think I saw a post that confirmed that conversations do carry over earlier.
I have acquired the grade of Master in The Last of Us story/character/game knowledge as I have played it through 9 times.
... I have no life.