One great example of the Deb/Jane dynamic was shown in the season finale, as Grayson sits at a pub and talks with Stacy and we learn that Grayson has been losing sleep. The reason? He has been thinking of Jane (a fact which he accidentally reveals to Stacy, only to instantly play it off as nothing). I can't help but think that his dreaming of Jane is because subconsciously he connects with the part of her that is still Deb...and this really sets up the next season for some interesting drama.
One other great thing about the scene is (surprise!) the song playing in the background. The band is Castaneda, and the song is called "Piece of Mind," a clever little play on words from this super-hip California indie outfit. They are a band that does a great job of mixing new wave, pop, and punk sounds into their own indie rock smorgasboard, and really sound great on mix tapes alongside bands like The Killers, Tokyo Police Club, MGMT and The Strokes.
Overall, I've been very happy with some of the great song choices that they have made for Drop Dead Diva, and I hope next season continues to have more great story lines, dialogue, and songs.