There's so much frightening stuff going on - shocks like the man in the parking lot, or the elderly couple, or the constant fear of losing ones grip on reality. Or just little sickening scenes, when the elderly actor kisses the blond girl (She is called Betty, isn't she?) and it just goes on a little too long. Or the utter evilness of the director when he plays the scene in the car with the black-haired girl. Strong, strong emotions all the time, yet the actors play so Lynchian and don't do very much.
And, of course, the beauty. There is so much beautiful stuff in the movie, the girls are two diamonds, fuck Hollywood mainstream actresses! The story of the actress who plays Betty is in itself incredible, because she had already reached that age where agents go "Oh sorry, but you're too old". And she hadn't made it yet. And you can feel that, it is just perfect, her shining eyes when she comes out of the airport, and these ugly creatures accompany her...CREEPY!
And yes, everywhere there are opposites, different possibilities. The world is much weirder than in Lost Highway where you can access different worlds, or Twin Peaks, where you have to search for the unexplicable. It's jumping right at you in Mulholland Drive, it's everywhere, and even that is unstable.
I dread the day when David Lynch discovers children...It would be like "Fanny and Alexander" on bad acid.