“You could structure a screenplay along the lines of what Peter Shaffer did with “Amadeus,’” Mangold told the Book Review editor Gilbert Cruz. “I don’t really know what I learned about Mozart watching “Amadeus.” But I do know that I learned a lot about how we mortals feel about people with immense talent.”

It might at first seem obvious why filmmakers won’t leave the subject of Bob Dylan alone. Search “Dylan” and “movies,” and the list — from documentaries like “Don’t Look Back” (1967) to fictionalized treatments like “I’m Not There” (2007) — turns out to be surprisingly extensive.