"Take John Dillinger (in "Public Enemies") for example, I felt a great responsibility to John Dillenger and his family to play him as close as anyone could to play him properly," said Depp. "I did as much research as I could. It was a great responsibility playing the Earl of Rochester, you know, because he was a real person. It was a great responsibility playing Joe Pistone in 'Donnie Brasco.'"