Bob Dylan: Knocking on Dave's Door

Has anyone seen this? I caught it on Showtime a few nights ago and really enjoyed it. Eddie Marsan plays Dylan and this is supposedly based on the urban myth that Dylan got lost while trying to visit Dave Stewart. He winds up at the home of someone named Dave, who is not at home but is invited in by his girlfriend. At first I was not exactly sure who was playing Dylan but Marsan does an excellent job. When Dave finally arrives home things really get interesting.