Matt Adler fans might be interested in this one, though he only appears as a very minor supporting character for three or four minutes total. But what the heck? It's one of the last films he's actually appeared in (because he's doing mostly adr loop credits these days).
In spite of that, however, this is one utterly dull movie. You have probably seen a zillion movies just like this one, a few separate stories which share interrelated characters (in one way or another). But, they're basically very short scenes of insignificant events between the characters (all connected through sex) in which they take the time to pontificate (both through action and dialog) to the point where your wondering if you're the only one who has no idea what they're saying or if you're the only one who doesn't care. While there were a few interesting things that occur in the movie (most all of them involving any of the scenes with Hillary Swanks character--since she was probably the most interesting, if not the most likable character in the whole mess), this is just about an hour and half of non-sequential nothing. It may work in some films (Tarrantino, borrowing from the anarchistic stylings of 70s french and Italian filmmakers was able to pull it off, among others), but this the way 'Quiet Days in Hollywood' worked out, it is one of the many that makes no sense, and rarely strives to do little more than waste time.