Anamorphic is very difficult because the distance from the lens to the person to focus is very long so you need a lot of distance from the camera to the person so that means that you need a lot of space.

Producers and studios want to make movies that are more appealing internationally and I think that you have to use your different cultures as an advantage to be able to make those movies.

I moved to Hollywood when I was 18. I never saw it as a disadvantage in any way. Quite the opposite.

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

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.

I could only shoot when the subway was on the other platform. Little things like that, and the platform is very narrow. It's not like you can hide if a subway comes so a lot of things happened because of that. Or a thousand people just came and looked straight into the lens like they didn't expect a movie to be shooting.

I wanted to move away from the disaster airplane movies that we have seen in the past and do something that was more mysterious, and delay until the end the resolution of the mystery, and then have to deal with the plane itself.