Not sure how widely known this is, but a couple of tracks on this CD issue were apparently remixed compared to the vinyl pressing. Especially obvious on "Zoolookologie".
Have to admit to not having listened to much of his solo output - but this, "There Goes Rhymin' Simon", and "The Rhythm of the Saints" are all fantastic albums by my standards.
Apparently this was released in the US as part of a Simon & Garfunkel box set, but it's unavailable apart from that...a real shame.