bobad - There is a little about that, although not an actual scene of them together. Cash refers respectfully to Dylan at least once, he's playing a song from "Highway 61 Revisited on his stereo in another scene, some Dylan photos are seen prominently on the wall in the record company office, and he and June do a spirited rendition of "It Ain't Me, Babe" in a concert scene. I'd say Bob's presence is felt in the movie, no doubt about that.

Spaw, you may well be right about the other biographical roles...I haven't seen them, so I have no basis for comparison there.

This is a very likeable movie. It ought to kindle much further interest in Johnny Cash's songs and his career.