On Chewies eyes, I'm not sure there's any doctoring, or it's incomplete. He has the same look in a Force for Change video.

http://www.youtube.com/watch?v=48dGX8zmK4I

I'm wondering if Peters vision is not what it used to be and he cannot wear contacts, or the original design is no longer comfortable at 70. There's also a taller guy in there in a black jump suit with eye black that might be a stunt double. He didn't appear to have blue eyes, but you'd think they would just give him blue contacts.

The growl also seems out of sync and too hard of a sound effect for a subtle mouth movement. I bet it's a generic placeholder from their sfx archives, and Han and Chewie were a last minute addition to the trailer.