In the riff-off, the competing teams are hosted by David Cross. The Bellas face off against their arch-enemies from Germany, as well as the Treblemakers and Bumper's (Adam DeVine) new aca-group. Oh and the Green Bay Packers, who are apparently an "aca-sensation" and definitely rip their tux coats off'to the dismay of everyone.

Director/producer/star Elizabeth Banks explains that the aca-camp scenes had a very particular use. "We always knew we wanted to find a way to bring Anna Camp back," Banks said. "But also give the Bellas an excuse to go out in the woods and be really physical."