I only noticed for the first time yesterday when I watched the Disney+ version of ANH that the entire time Luke is trying to talk Han into flying with the Rebellion at Yavin, C-3PO and Chewbacca are chatting calmly in the background.
I’ve always loved this!
I’ve also always figured this is why he’s so concerned for 3PO in ESB. They’ve really become friends. I guess being on Chiewie’s side during chess games payed off.