Something that maybe in Episode 3 that may not make much sense given conversations from Episode 4...
In Ep3 it is rumoured that Chewbacca will carry Yoda on his back whilst escaping from the Clonetroopers on Kashyyk, and that Yoda uses the Force in front of Chewy and some other Wookiees - repeatedly - to aid that escape.
From the poster 'BulbaSeb' on tf.n:-
In Ep4 Han stated that he doesn't believe in hokey religions or some mystical all powerful Force. What? Chewie just let's that go? I don't think so. Over the years, Chewie's going to let Han know a thing or two about stories from the old days - or at least his past.
"Roowrr ror rrooor roror roo"
"Really buddy, I didn't know... a little green guy you say?"
"Rrrwor rrrowwwwoowr rrrowrr"
"Right, and you expect me to believe that he threw missiles away, and pushed stormtroopers to the floor just by waving his hand"
Chewie shrugs. End of Subject.
I don't buy it.
Maybe we need the intervening episode, like Troops! in ANH
On Tatooine:
ObiWan - "Say, aren't you a Wookie? I thought you were all but dead"
Chewie - "Rrrwrrorr rrwrorwrr"
ObiWan - "Yes, I am a Jedi. I want to thank you for saving Master Yoda."
Chewie - "RRrrrwweerrr rrrroroo"
ObiWan - "He saved me a few times as well. Now I need a ship to get me off Tatooine."
Chewie - "Rrrwwrrr wah wah"
ObiWan - "No, should I have?"
Chewie - "RRroowwwooorrrwwror"
ObiWan - "Never heard of the Kessel run. But, if you can get me and a few friends out of Mos Eisely, no questions asked, I can pay you handsomely"
Chewie - "Waaahrrr RuhRoh"
ObiWan - "Lead the way to the captain of your ship. But promise me that you'll never speak of the Jedi and pretend not to know of our existence."
Chewie - "Rohkay"