If you know anything about Robert Johnson...
...you would know that he DIDN'T use a pick to play guitar - he played fingerstyle (i.e. plucking the strings with the fingers of his right hand). So, the explanation about the origin of the pick of destiny makes no sense. It probably would make more sense to say it came from Chuck Berry, who DID use a pick, and was THE pioneer of rock & roll guitar.
I submitted this as a "goof" but it never got posted. Probably lost in the millions of submissions imdb workers sift through every day. Sorry if someone already posted this. Still a really funny movie though.
Am I right or am I right?