"Secret Messages"

I listened to Secret Messages a couple days ago and noticed a small feature in the title track.  In the line "They're calling ev'rywhere" at ~1:54, the three syllables of "ev'rywhere" are all sung to different pitches (G A B), giving a sense of breadth.  When the line is repeated at ~3:42, there's also a glissando from the B down to a G.

In the two occurrences starting at ~2:43, though, the pitches are simply G A G.