Those are strings at the very end and, though they don't distort, or at least I don't hear any at this point, I think that Garfunkel's voice just before those ending stings on the word "mind" does distort just a tiny amount, as though the limiting amp on his vocal was pushed up against the wall. Also, there's a hint of shrillness, and on both my Helikon and Argo i do I hear it, at this point in the recording.
Back then it was popular to push tape into the red but it could also be the caused by the cutting of the lacquer or the pressing itself. The vocals were recorded "hot" as most pop recordings were in those days. In any case I can live with this relative to all the other vinyl anomalies; it's a labor of love.