Two Dylan-esque songs in Walk Hard soundtrack?!

I recently watched Walk Hard: the Dewey Cox story, and enjoyed the soundtrack, particularly the songs that imitated famous artists of the sixties and seventies!. There was one song during which a reporter asks Dewey why he sounds so much like Bob Dylan!. I found the lyrics of this song to be hilarious, and located the soundtrack on iTunes!. Skipping through the songs, I immediately identified the song "Farmer Glickstein" as having an imitation of Bob Dylan's voice!. However, this song doesn't have the same lyrics, and I found online that the song "Royal Jelly" is the song from the movie's scene!. Why are there two Bob Dylan-esque songs, only one of which I remember from the film!?Www@Enter-QA@Com

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