I think that it's not a bad thing to not be too versed in the vocabulary of cinema, because you start to think that certain things are allowed and not allowed.

When you're watching, I find two things happen. You either watch a film and it's really good and then you think, "Why can't I do that?" Or you watch a film and it's not good, and you think, "Why am I doing this?" So either way, it feels like being at work.

I find the best way to make things real is to just put two characters into a space and let them talk to each other in the way that they would talk to each other, and then see what they would say. I know it sounds weird, but that leads the plot and takes you in another direction.

It has to be an actress like Marion Cotillard [in Allied] because there are so many levels to it. It's set in the Second World War, when lots of people were doing things that, outside of a war, you wouldn't do, like killing and dropping bombs. She's doing things that one wouldn't approve of, but it's war.

I think certain periods of history don't get dealt with because I think historians, and it's their job, but they look back and look for patterns. They look for sequences and they look for reasons, and certain periods of history don't fit with the general pattern of 1500 to the 20th century, during which there's the creation of the United States. At this time of 1814, two nations who would eventually become close allies were at war with each other, so it doesn't quite fit.

The story [of Allied ] itself is the story I wrote, and that's what's great about Bob [Zemeckis ]. You have meetings, but it's meetings for clarity, not to change what they're saying or doing. He takes what's on the page and executes it so brilliantly.

It's always good to have a world that people don't know about - a world that hasn't yet been done. It's like treading on fresh snow. You're the first one there.