A wonderful clip - which makes me wonder: how well-known was Elvis' version among the "ordinary music audience" around this time? i think I've heard a version of the song With White before EP sang it...and one after, at the latter was arranged very similar to Elvis's arrangement - like this one...
I believe Elvis flew TJW to the International in Feb '70, so he could see the Presley take on Polk Salad Annie.
I also seem to remember that TJW was an observer at the July '73 Stax sessions where Elvis cut another two White compositions, I Got A Thing About You Baby and For Ol' Times Sake.
BTW, a few of the guys who played on White's original (late '68 / early '69?) recording of Polk Salad Annie also played on Elvis sessions, such as David Briggs (and possibly Putnam and Carrigan?).