I know the owner of the Idol being shown at SDDC as some of you may as well, and it is a production made piece. Sideshow should also take note of the photo in the backround which shows the correct style of mouth which the Idol sitting in front of it mirrors the photo perfectly. My guess is that SS did get ahold of one of the Idols in the Lucasfilm Archives, therefore they are totally immune from hearing why they may not be correct. After all, if it came from the source how can they doubt it's authenticity?
What they may or may not know is that many of the existing Idols made for the production were in bad shape and were restored some time in the early 1990's for a Japanese exhibition which had a catalog that was later turned into the Lucasfilm Archives book. When some of the props where resculpted they were not exactly matching what we see on screen. Some of the minor details were changed, such as the mouth. They may have used a stunt Idol with the frowned mouth (an ealier prototype of the final Idol seen on screen) to resculpt some of the destroyed Idols for use in the Japanese show.
In short, SS may be using either a stunt Idol, which differs from the one's seen on the screen and in all photos, or they're using an improperly resculpted original, which still differs from the one's seem on the screen and in all photos.
I don't expect then to make any changes but it would be nice if we could get some sort of feedback from them. We all give it to them but rarely do many of the tough questions get taken on.