I think that everything changes when it goes through the Mac; it's cheap. I think people then don't pay too much importance to the take, if you can do 40 takes.

I think video is very useful, but it's very useful when you want a certain reality.

You have to offer sort of an evolution visually and do things like you've never seen before, like a fight between two men in a toilet on an airplane which was very exciting.

You have to think of each stage of the movie and how it progresses, get into the state of mind of the character, and then match the camera to that, and keep making it tighter and tighter and crazier and crazier so people don't get bored. You know you cannot do a similar shot that you did at the beginning of the movie at the end.

For me, it was the challenge of doing a movie that is in one location. Usually, there are a few scripts obviously always going around with stories that happen in one location.

If you do any thriller or horror movie a big part of the process is accounting for the cell phone.

The hard part on the subway is that you have, let's say, eight hours, but you have to hit these deadlines. From here to here, you can use this part. From this time to this time, you can use that part, and you have to hit them and it gets very stressful.