You will learn which chapters have optional conversations and how to unlock them.
Optional conversations arevery easy to miss.
you’ve got the option to distinguish them by the specific icons located above their heads.
You must be on your guard, as you’ve got the option to easily miss those moments.
The second one can start once Sam lights a fire.
Walk towards the locked door illuminated by sunlight, and only then talk to Sam.
Solve the turning mechanism puzzle, unlock the exit door and get to the viewpoint.
Sam should stop and give you a chance to talk to him.
Approach the tower and talk to Sam and Sully (this specific order).
You will have it while crossing the bazaar.
Approach the man with the lemur on his shoulder and pet the animal.
Then, walk on.
The first one may take place soon after he and Nate will have to split.
Another optional conversation takes place towards the end of this chapter, during the exploration of the pirate hideout.
Start by examining the model in one of the rooms.
Then, examine the figurine, two sketches and three paintings on the walls.
Finally, swim down the narrow corridor to the neighboring chamber and examine the table there.
Thanks to this, the conversation icon should appear above Sam’s head (the screenshot).
Take several steps ahead and after a while, Sam will want to share his thoughts on the vault.
After you start exploring the room, he will call you for the second time to have a conversation.
Pick up the letter on the desk.
This will unlock the first optional conversation.
The next one will take place after you enter the botanical room.
Soon afterwards, you will start another conversation.

Two more appear after you eliminate the two mercenaries.
The last two take place towards the end of the mission, during the elevator ride.
Conversations in chapter 18 - New Devon
In this chapter, there are five optional conversations.
Another one takes place when Elena approaches one of the rocks Northwards of the sign.
The third one takes place in the river that you drop into, after the bridge collapses.
The last one takes place in the musical room in Avery’s estate.
Conversations in the epilogue
Here, there is only one conversation.
This site is not associated with and/or endorsed by the Sony Computer Entertainment or Naughty Dog.
All logos and images are copyrighted by their respective owners.