I have no idea who Brian Jones is, so I didn't get that one.

That's the cool thing about MST, they deliberately did obscure references. Their reasoning is that even if only 1 percent of the viewers get that particular reference, the ones who do get it will either squirt coke out of their noses because it was so targeted, or at the very least say "oh my god, they're inside my head!". With as many references as they put out in a given episode (hundreds by some counts), they can afford for some of them to be kind of obscure.

For example, there were a couple of references to Rush in the series, and I completely lost it when they did them.

Every episode was like watching a pop-culture encyclopedia. Some found it incomprehensible, but I just ate it up.