Whole cast interview featurette thingy with interviews from Michael Caine, Marion Cotillard and Cillian Murphy:
Inception star Tom Hardy talks about working on a film of this scale, working with director Christopher Nolan and the cast dynamics.
Inception star Joseph Gordon-Levitt talks about his character "Arthur", working with director Christopher Nolan and preparing for the physical demands of the film.
Inception star Ellen Page talks about her character "Ariadne", what drew her to the film and working with director Christopher Nolan.
Inception star Leonardo DiCaprio talks about working with director Christopher Nolan and the ensemble cast and the idea behind the film.
Ellen on Jonathan Ross:
Source 1, 2, 3
ETA Ellen on JRoss. Shes a cutie patootie tbh, i was expecting her to be super serious. Check out this vid: http://www.youtube.com/watch?v=H18RgOE_EK8&feature=watch_response_rev to see her juggling with Penn and Teller during Jimmy Carr's interview (starts at 2:45)