I have a boundary problem... I need to know when to give and when to back up. I'll help someone across the street and then into their homes and they'll start telling me all their problems... and it turns out they're insane and want to kill me. I've got to know when to stop!

I think having a good life prompts it... anybody who has a good life and looks around them sees the enormous disparity that exists in the world between those people who do and those that don't. I can't say we walk about our guilt a lot, though. If we do, it probably comes out in the form of self-loathing jokes. But it's a tough thing to wrap your head around... the have's and have not's in the world.

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 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.

Catherine Keener really gets me. She and I have such a shorthand together.

If I had cast someone else who didn't have that kind of timing, it would have been leaden and one note. But Ann [Morgan Guilbert] made her really human and really funny without being caricatured or over the top. She feels like a real person.

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.