World War Z director Marc Forster recently took a break in production to promote his new movie Machine Gun Preacher, which hits theaters September 23. Take a look at the video interview below where the filmmaker reveals how he tried to keep the spirit of Max Brooks' zombie novel in his adaptation of World War Z.

"Obviously the book is not written as a narrative. You try to take things from the book, but at the same time you're changing certain things. I do feel we're trying to keep it in the spirit of the book because it's important. There are a lot of fans and people who love the book. In that sense, I feel we are doing our own film, telling our own story because we had to. But we're trying to still include as much as we can from the book."

The director also discussed the controversial point of how the zombies actually move in his version of World War Z.

"The one thing, which a lot of people will have discussions over, is the movement of the zombies and how the zombies will move. In Max Brooks' book they move in the George A. Romero fashion. I feel like we have a little bit of a different approach, but it doesn't exclude that they might not eventually be fashioned how George A. Romero's zombies move. It's just a little bit of a different approach. I think that will probably be the biggest discussion there will be."