The room will become more "live" once the drywall goes up, but the insulation, staggered studs, double drywall, and Green Glue aren't for live/dead room acoustics, but for holding the sound in (or out) of the theater. The video does show the effects of sound absorption as-is though...
_________________________
http://ht.buol.us
M60s, VP180, VP150, QS8s, M3s, SVS 20-39PCi, Shakers