Não: Eles nunca pretenderam que ele falasse inglês (Galactic Basic)
De acordo com uma entrevista com Ben Burtt (a voz de Chewbacca), eles nunca pretenderam que Chewbacca falasse inglês e sempre pretendiam dublar sua voz. Isso com base no fato de que ele foi contratado para fazer a voz durante o estágio do roteiro. As linhas inglesas do Mayhew que eu imaginava tinham como objetivo ajudar os outros atores, especificamente a Ford, a agir contra.
Ben Burtt: Chewy was actually the first voice that I was hired to work on back when Star Wars was just in the script stage. They knew they had this character, Chewbacca, that was going to have to act and appear in scenes with other actors and the question was: what would he sound like?
He's not going to speak English. He's going to speak in some sort of alien/animal type of voice, its supposed to be an intelligent language, but not English, not German not French, not something people would recognize, it had to be some sort of animal.