I don't think I've seen mention of this. Just came across it (via Google) and it's the experience one person had at the Paley Center when the SWHS was screened at Christmas. His assignment was to cover the screening for "The People vs. George Lucas".
He hadn't seen it before.
And he wasn't impressed.
Most of the video is his brief reports in a washroom stall -- to avoid security who would disallow his video camera -- but it is interesting. And a few brief seconds did go into "The People vs. George Lucas."
Where I originally found it:
http://redcowentertainment.com/2012/03/doug-burgdorff-at-the-paley-center-screening-of-the-star-wars-holiday-special/
Direct link:
It's a bit under 8 minutes.
Found it when I searched for star wars holiday special documentary, hoping to see a sign of something that Bruce Vilanch mentioned in an interview. Some people were shooting a documentary... that apparently went nowhere. (The interview was on "Feast of Fun" in July 2010.)
(And why did I have to jump through hoops to get this posted without the lovely markup code?!)