Mike L? Mike M?

I watched 'Mullholland Drive' the other night.

I grasped the 2 distinct sections of the movie, however i was unaware of how they fit together. I asked Mr. Green, my boss and an avid David Lynch fan, what the hell was going on. He stated that it's a metaphor for the 'joke' of Hollywood. Sadly I still needed to look up a synopsis for the film. Don't get me wrong, it was definitely a money film, I'm just apparently an idiot.