I thought of the scene while writing scenes with Rebecca [Hall] and wrote it like an opening montage of showing where someone works. If you see a film about a car mechanic, you'd show the place they work and what they do. So, that's what I set out to do with Rebecca's character. I thought it probably wouldn't even make it into film but I ended up liking it.

I hear people talk in my head and I write it down. I choose where they live and how they dress to be real. That person wouldn't wear that. That person wouldn't say that. She can't afford to live like that. All that bullshit that so many movies have in them. I don't want to see that.

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.

People say to me all the time that I threw some money into some guy's coffee cup [by accident, thinking they were poor]. People do make the same sort of mistake. I've made attempts to volunteer that have been calamitous!

It's a struggle. It's really, really hard. I'm already nervous for my next one. You have to put more and more movie stars in movies these days. And of course, I would like to have more than $3million to make it. But, again, if that's what I was offered I wouldn't turn it down. I guess studios know that. But I'm one of the lucky ones, I guess.

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.