What a bunch of horseshit.
The entire plagiarism accusation is based off one album "Love & Theft" in coincidence with a book. You'd have to be in some isolated island to truly have iconic original music. Every artist one way or another plagiarizes off someone's work. It wasn't like Dylan took some guy's song, and started claiming it was his own. It simply a collage of memories for Dylan, he probably picked up the book, read it and it inspired him.