Maybe this has been noted elsewhere, but I think I just discovered something surprising and cool. Watching The Lost Rebels deleted scene from ROTJ, and the Mon Calamari sounds like Jim Henson/Kermit the Frog/Ernie to me. I thought, "I know George Lucas wanted Jim before he considered Frank Oz for Yoda. Maybe he finally got him to participate." Then at 4:47, the director is talking to him and calls him Jim! This may be old news to everyone, but I'm pretty sure that's Jim Henson under that Mon Calamari suit!