No, they have always been there. Not as obnoxiously as things like this appeared in the PT, but they were there. The Sarlacc burp never really bothered me, it is a made up alien lifeform after all, so I don't feel I have the authority to say a creature like that wouldn't burp, or make a burping sound after swallowing a mass quys. And I found the tarzan yell funny when I was a kid, but now I can see it as another bit of odd humor that made that film the awkward step child of the trilogy. And then there was the scene were the giant frog belches after eating the giant fly... Return of the Jedi, and in turn the entire SE were gradually preparing us for things to come... and we still weren't ready damnit! We could have never been ready! *sobs*! :P