source: Slashfilm
"That was probably one of the mistakes I made in that. My thinking at the time was that Chewbacca, despite the pain he was feeling, was focused on trying to save Finn and getting him taken care of. So I tried to have Chewbacca go off with him and focus on Rey, and then have Rey find Leia and Leia find Rey. The idea being that both of them being strong with the Force and never having met, would know about each other — that Leia would have been told about her beyond what we saw onscreen and Rey of course would have learned about Leia. And that reunion would be a meeting and a reunion all in one, and a sort of commiseration of their mutual loss."
Abrams adds the real mistake may have been in how he blocked the shot:
"Had Chewbacca not been where he was, you probably wouldn’t have thought of it. But because he was right there, passed by Leia, it felt almost like a slight, which was definitely not the intention."
I thought this was interesting for J.J. to address since many including myself thought Leia and Chewy pretty much ignoring each other right after their suffering such a huge mutual loss was a bit jarring.
