Jim Croce's "Walkin' Back to Georgia"

I just listened (for the first time) to the first disc of Jim Croce's The 50th Anniversary Collection.  I noticed something about "Walkin' Back to Georgia," which I've heard only once before when I listened to the You Don't Mess Around with Jim album last June (I haven't gotten around to listening to it again yet).  It's not that big of a point, but the "down" in "And if she's still around I'm gonna settle down with that hard-lovin' Georgia girl" has a sort of vocal glissando so that it goes down in pitch as it's sung.  The way it's sung reflects its meaning.