The pop bumpers are adorned with the images of Chris and Kat -- the green pops are Chris, and the red are Katrina. The choice of colors was arbitrary. This is the playfield feature that I like best -- just saying "Chris and Kat Pops" cracks me up!
The rollover buttons above the pop bumpers light either the Chris or the Kat pops. The pops score one point when unlit and ten points when lit.