I listened to the second disc of On Air - Live at the BBC, Volume 2 yester-day and noticed a small feature in "Glad All Over," specifically in the line "My temperature's low; fever is high." "My temperature's low" is sung almost entirely to C# notes (I think "low" is sung with a descending glissando from C# to A), and "fever is high" is sung to a group of ascending notes (C# C# D E, I think). The first half of the melody for this phrase descends, and the second half ascends, musically giving a sense of the "low" and "high" in the lyrics.
This is also present in the version on Live at the BBC and in Carl Perkins' original (although Perkins' is a half-step lower, and this particular line might have some slight differences in articulation).
