When I listened to the first disc of The BBC Sessions yester-day, I also noticed some new things.
I noticed a couple significant melismas in "Just a Little Bit." "All" in the line "No, I don't want it all" is sung with a melisma (B A) for a sense of entirety. "Low" in the second "Turn the lights down low" line is sung with the same melisma, musically giving something of a sense of that decrease.
I also referenced the version of "Just a Little Bit" that's on the second disc (which is the same performance as that on the Live at the BBC disc of Zombie Heaven and the only one I'd been familiar with until I got The BBC Sessions). In that version, "all" is sung with a different melisma (A E D, I think), but it has the same effect. "Low" isn't sung with a melisma in either "Turn the lights down low" line.