Reba demonstrates contrapuntal texture in some of the music between the last Bag it, tag it and the outro jam before the whistling. Page and Trey are playing contra melodies throughout that section.
Easiest example of this technique is probably in the outtro to Silent in The Morning where Page is singing one melody,
“Silent in the morning
You found your voice that brings me to my knees”
while Trey responds at the same time singing another
“I will not dismiss you, shelter you, speak with you
Smile at you, trust in me, hed like to brush you off, and Id agree”
In BATR, there is actually a 3 part contrapuntal going on vocally, but this is probably more closely described as a “round”, even though the melodies are slightly different, the differential timing makes it more of a round.
The three parts are:
The crystal haze, And hear them bouncing round the room, The never ending coral maze - Page
Then before and now once more I