Joel does comment about Lucasfilm being an "import from outside Hollywood," and briefly discusses his first encounters with Star Wars at the very end, but in some ways the most interesting quote of the interview for me was:
Getting back to your original question about the way I view movies, yeah, as time went on I began to have affection for all these weird movies we were working with. I don't have the attitude like, "bad movies suck and I'm going to put my eyes out with a pen because I curse you, bad movie!" I like all movies, good and bad. The good ones I call great, and the bad ones I call horribly great.
For me, that's a healthy attitude to have.
(In other "riffing" news, I noticed that the next "Rifftrax" is going to be for Transformers... and I did contemplate how my brother had been very offended by that movie. I'm still not sure I'm going to investigate even that one, though.)