I guess I always knew going into the movie that casting that part would be difficult. Oliver just felt likeable. I felt it would be hard to dislike this man. I don't know why, but I'm sure other directors have felt the same when casting him. Oliver is goofy yet formidable, smart but likeable... I didn't want the character of Alex to be nasty or demonised. I wanted him to be struggling with his actions.

What are we taking from people and what do we give is a life-long struggle, I think, for most of us. Who are we? Do we like who we are? Do we know who we are? Do we care? Does anyone care? That's such a big topic. I could tackle that in many movies. So could other people.

I would still encourage somebody, if they wanted to make a movie, to just go take a movie camera. That's clearly been shown to work. It's just how do you get it seen?

I never get tired of looking at her [Catherine Keener] and it always surprises me, despite how many hours of film I've shot on that face. She's fantastic. She does comedy and tragedy so equally well. She wears her feeling so on the surface for both. I try to stop myself from casting her but I just keep coming back to her. She's just so fantastic to work with.

But then male directors also have a hard time getting their movies made... not as hard as women but it's a tough time for any movie this size. And that particular movie [The Hurt Locker] was so specific. It couldn't hurt, of course, and I'm really glad for her, but I don't know how much it will change things, if at all. The film industry is still so sexist.

The casting director on the movie made me aware of her. She told me what to watch Starter For Ten, which I did and thought she was great in. She was just so charming and beautiful. But I felt she could probably look plain if we tried. And when I subsequently met with her, I was so charmed by her vulnerability and sweetness. Those were two qualities that were the most important for that character.

I thought I could make a sarcastic joke about it. But it's based on my own struggle with how much to give, how much it's really helping or not, and how foolish or not I feel. Giving sometimes backfires.