Look at the Coen brothers. All their minor characters are as interesting as their protagonists. If the smaller characters are well-written, the whole world of the film becomes enriched. It's not the size of the thing, but the detail.
“It's nice when you work with someone who has an eye for clothes and will show what you've given them.”
“I think the country is very settled in a lot of ways, and we saw that after the Democratic Convention. I think a lot of the bump that we enjoyed came when John Kerry selected John Edwards as his running mate.”