When we were doing 'Freaks and Geeks', I didn't quite understand how movies and TV worked, and I would improvise even if the camera wasn't on me. I thought I was helping the other actors by keeping them on their toes, but nobody appreciated it when I would trip them up. So I was improvising a little bit back then, but not in a productive way.

When I read the book [The Adderall Diaries] I loved it, and I maybe had an inkling that there was a lot of good material in there. I didn't quite know at the time how to adapt it into a film, but I hoped I would figure it out one day.

I still don't like going to bed alone.

I drank from the bottle again and it was a scary plunge because I always wanted to take too much. It hurt, but it was also impressive, like being in the hands of a bigger force. And because of that, a relief.

I get to work with incredibly talented young filmmakers and students, and their attitudes and relationship with film is still so pure. That re-inspires me and reminds me why I got into it and what I love about film, and allows me a little reprieve from the business side of it. And it rekindles my love of film.

Did you ever see Cheech and Chong's Up in Smoke? That's what happens if you really smoke weed and make a movie. You get two guys and no plot and it's basically like, 'Yeah! Let's drive a van made of weed!' And that's pretty much the movie.

I become kind of obsessive about research.