Nolan: The one thing I have heard a lot is the kids are wearing the same clothes at the end. And they’re not. [Laughs.]
Wired: They’re not?
Nolan: No, they’re not. I’m not giving anything away there. Also I’ve read a lot of misunderstanding or misremembering of the way those kids are portrayed onscreen. But on the Blu-ray, people will be able to check, say, the ages of the kids.
Wired: The kids are in different clothes and are older at the end?
Nolan: Yes, two sets of kids! The younger version of the boy is actually my son, and it’s not him who turns around at the end. There’s no ambiguity here.
Wired: I was so convinced that they were wearing the same clothes.
Nolan: They’re very similar but not the same. That I would very much like people to notice, because it was a very, very difficult thing to pull off, taking two sets of kids all around the world and filming things two different ways....
Wired: Let me try another reading on you: When Cobb and Saito are in limbo, they agree to a reality where Cobb can see his kids again—and at the end of the movie we’re still in limbo. Care to rule that out?Nolan: If I start ruling things out, where do I stop? I will go as far as saying that wasn’t the way I read it. [Laughs.]
--Wired interview with Inception director/writer Christopher Nolan