I missed the lecture, but got the lowdown just by reading others blogs on it. Reality, the Matrix and Inception all have one thing in common:  Reality is fixed, it is just that people can mix fiction with fact in their own heads.  I recall a dream I had as a kid about watching a 747 airlplane go down my Grandmothers street, and the dream was so real and repeated often so that I really believed I saw that. 
In these two movies, the main characters shed their denial and then learn that "What you believe you can achieve"...
And what reality and movies have in common also:  There are always good guys and there are always bad guys....and LOVE always motivates us to be our best.   And in my favorite movies, the good guys always win and the lovers always ride off together...but that is not reality 100% of the time.  

I believe that ART is a way to express who we are, while we learn what we are, while we search for the meaning of it all.  It is something I believe wired into us by our creator and we are all given the opportunity to find out what it is we were given to share with the world.  CREATIVITY  is in everyone and the kicker is:  There is no life that is meaningless or uncreative unless the choice is to take the easy way out and check out of reality.  Many of us do check out of our reality to watch someone else's supposedly true reality with REALITY T.V.     I checked out of reality for 10 plus years as an alcoholic,the reality is that I am still catching up after 23 years of sobriety. 

 How I see it is ...Reality is what artists are inspired by and how they tell the story of themselves and the world around them...what they observe.   Writers, artists, comics, teachers, and other types of creative types are just throwing out their spin on the same stuff:  Reality.  Sometimes you can make reality really funny as a comic, and lighten it up, and sometimes you can make it real sad, and how it is spun can have an effect.  That is what  artists hope to do I think:  Make an emotional impact.  What better way to cause us to think, than through the feelings!  ARTISTS tell us what is here and now (or reporting on what was here and  then).  IDEAS are what might be coming down the creative pike: Tomorrows reality.
I am sure there was more to the lecture and a lot more wisdom from Glenn, but the real truth is, I wasn't really there! So.. I will have to wait for the movie