Oh there's not just one pruneface! There are three. And here is a gallery documenting what, as far as I know, are their only appearances: http://imgur.com/a/h4zdJ
A Prune Face appears at the Rebel celebration, dancing in front of an Ewok hut.
About the SE Mos Eisley scenes. At the Elstree Empire Day in May, Gary Kurtz said that it was never the idea to have Mos Eisley like that. The original idea was how we see it in the original film. An out of the way, almost deserted town, like that from a Sergio Leoni western movie. Then someone asked about the Greedo scene. Gary said that Han shooting Greedo under the table was pre-emptied. Han knew that Greedo was going to kill him so he shot him before he had the chance. End of story.