Joseph Gordon-Levitt has confessed he ignored Christopher Nolan's advice when it came to directing his first film.
The 32-year-old actor has worked with acclaimed director Nolan on his box office blockbusters Inception and The Dark Knight Rises, and is currently doing the festival circuit with his directorial debut - comedy Don Jon - which he also stars in, alongside Scarlett Johansson and Julianne Moore.
Joseph told the HuffPost tha Nolan had queried his decision to appear in the film himself, when he was also working behind the camera.
He revealed: "I told Chris Nolan that I was going to direct a movie and he was instantly supportive, which meant a lot to me. I told him I was going to act and direct at the same time and he was like, 'Are you sure you want to do that?' So, he wasn't just like, 'Do whatever you want.'
"He was like, 'Are you sure you want to do that your first time?' I said I really do and he was like, 'OK, but I'm raising my hand now and saying that you might want to think about that. That's a whole extra challenge that you maybe want to do your second time.'
"Totally valid perspective! Completely valid. I happened to go the other way and still do it, but a very valid question and I'm glad he asked it. Most people probably wouldn't want to ask me that and I'm glad he did."
Joseph also revealed he had had a lot of "constructive criticism" from Rian Johnson, who directed him in Brick and Looper. And he admitted he had chosen to ignore some of his points too.
He said: "I've agreed with a lot of them and then some of them, he made a suggestion and I was like, 'This is hard to do because it's Rian making the suggestion, but I'm going to have to disagree and stick to my guns here'."