Don't rent Laurel Canyon. It's a very bad movie. I can't understand why critics didn't highjack every available entertainment media outlet and proclaim this fact in loud voices or IN UPPER CASE LETTERS — "LAUREL CANYON BLOWS!" Instead most of them claimed it was pretty good, all in all.
But it isn't. It's awful, and the characters never shut up. When the movie reaches its climax and the characters have their big blowout and call each other fucking assholes, I wasn't rooting for our protagonist, and I wasn't hoping that anyone would get their comeuppance. All I could think was, "What a couple of fucking assholes."
Lou Barlow is in it, more or less as an extra, perhaps to lend authenticity to the rock milieu the movie tries to conjure. That's about the only thing I found interesting about it.
One way to amuse yourself while watching Laurel Canyon is to reimagine it as a porno movie. Every illogical/improbable character reaction makes more sense that way. "This is where the lesbian scene would go." "This would be a good time for a solo scene in the bathtub." "I'd say the orgy sequence is coming up in about five minutes."
The trick (if you want to keep your dinner down) is to imagine it as a porno movie NOT starring Christian Bale and Kate Beckinsale. Eww.