"How does it feel?" is one way by which to measure a movie. But if you've seen "A Complete Unknown," the Bob Dylan biopic that opened on Christmas Day, you may have left the theater singing to yourself (to the tune of "Like a Rolling Stone"): How much is reeeaaallll?

"A Complete Unknown" director James Mangold and Edward Norton (as Pete Seeger) weigh in on what's fact and what's fiction in the Bob Dylan movie.

A Complete Unknown isn't a traditional biopic. Instead of covering Bob Dylan's life story from birth to old age, it covers the period shortly... In 'A Complete Unknown,' Timothée Chalamet captures the idea of Bob Dylan A Complete Unknown isn't a traditional biopic.