Definitely. If you look close enough in Let the Water Run, you notice Jerry (Nelson) has two different puppets of Gobo. The one used in the first two episodes only appears in this one when
sings "Do It On My Own." The rest of the time, he looks kind of messed up with shorter hair and more of a bug-eyed look. But yeah, I'd say he just looked better and better as the episodes went by. I also noticed that his hair goes from purple to like a hot pink, or just a much brighter purple. At any rate, Gobo's personality changes too. He's definitely more sure of himself as time goes by.