Be open to other people's ideas. Don't get arrogant about your ideas. Shoot a lot of options so you're not stuck with just one version of something.
Jonah Hill'Funny People' is my favorite performance of myself to date. Even though it's a comedy and there are serious moments, I really felt like Leo felt like a real person. It didn't feel like I was playing myself. Whether it's a comedy or drama, I just try to make it as realistic as possible.
Jonah Hill