It shouldn’t come as a surprise that in addition to befriending Hollywood’s most famous directors, Joseph Gordon-Levitt is also friends with most of Hollywood’s elite actors. 
Joseph Gordon-Levitt in 'Looper'
In an interview from Sundance, promoting ‘Don Jon’s Addiction’ [which he wrote, directed, and starred in], Joseph talks about how convinced Anne Hathaway and Channing Tatum to make a small cameo in the film.
He says that all three of them had met while doing ‘Havoc’, adding, “We’ve all stayed really good friends, and I’ve made three films with Chan and two with Annie, and Havoc was the first one for both. And it was Chan’s first movie. But it was really sweet of them to do it and they are so funny. They had such a fun half-a-day, and you could really tell.”
Joseph Gordon-Levitt spoofing Channing Tatum on SNL
Joseph also talks about learning from the best directors, saying, “The year before we shot this I was lucky cause I worked with Rian Johnson (Looper) and then Chris Nolan (The Dark Knight Rises) and then Steven Spielberg (Lincoln), and certainly was paying attention. One thing I’ve noticed that all three of those guys have in common is balancing the homework that they’ve done and the vision that they have with being open to having spontaneous things happen. That, to me, as at the crux of what a director does.
Joseph Gordon Levitt talks about Don Jon's Addiction
