The phrase "heav'n and earth are full of Your glory" is sung to this melody (no title is listed for the tune):
"Heav'n" is sung to a higher pitch than "earth" (both are D notes, but they're an octave apart), which musically illustrates their relative positions ("heav'n" above "earth").
In looking at this phrase again, I also noticed that "glory" is sung with a melisma (A F# E), musically giving something of a sense of being "full."
At the end, "Hosanna in the highest" is sung to this phrase:
"Highest" is sung to two D notes, and - appropriately - this is the highest pitch in the tune.
