A resposta é revelada em este Pergunte-me qualquer coisa com Peter Mayhew (perguntas e comentários de pessoas on-line estão em negrito, os comentários do Mayhew são texto simples). Mayhew explicou que ele havia acabado de improvisar a frase "o velho é louco" (e disse que "fez muito isso naquela época", provavelmente indicando que os clipes em Império dos Sonhos e < em> Deleted Magic de Mayhew-as-Chewbacca falando inglês no set foram todos diálogos improvisados), e ele também deu sua interpretação da linha de Chewbacca no final de A New Hope :
As for me, I think that Chewbacca deserved a medal after the first death star destruction. What was that last word he spoke in Episode IV? Did it have something to do with not getting a medal?
No, actually, the last words Chewie spoke in Episode IV was to dismiss the troops and thank them for their service.
I can answer this. For A New Hope there were lines. In the Documentary that came with the original trilogy (sorry I forgot the name) there is a raw clip of the scene where Obi-wan leaves the crewin the controll room. Chewie: That old mans crazy ! Han: You said it buddy.
Actually, I said: "The old man is mad" and I just made that up on set. Did that a lot back then. But hey, everybody knows what Chewie said....