One of the greatest scenes in film history...
... is Half way into the film when Clooney and the other guy walk into the apartment, and the director yells cut. He tells them that they're out of money, and an actor from the guild says everyone who talks gets $400. Then Clooney mentions product placement. The follow up scene where they bring in the Pepsi and Crest is a classic too.
Overall, a decent film, sometimes there's long stretches between good jokes, but that entire sequence is fan freaking tastic...