I don't think he's pissed at all, its just a stunt to promote an SNL appearance or something. Matt Damon did something similar on Kimmel's show before.
Worst show in the history of television. The only way they'll ever release a worse show is if they film a show that gives you cancer when you watch it.
Entourage was great for its first season, maybe season and a half. But the episode with James Woods looking up into the security camera screaming about his fucking tickets was television magic, and there's no way they'll ever make an episode anywhere near as good. And the producers of Entourage know that, so they're not even going to try.