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.

If anything, I learned most from being a huge fan of his and watching movies like Annie Hall and Manhattan over and over again - that influenced the kind of movies that I wanted to make more than anything else.

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.

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 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 don't know where my next movie is going to get financed or if it will. I think every filmmaker is probably worried about that, unless their movie made a fortune. My movies make a profit, but obviously not a fortune. So yeah, it's scary.