Apparently there was quite a bit of drama going on behind the scenes of the finale. I noticed during BotS that half the HM's had gone missing at one point. Turns out they were booted by security during the Michelle/Keith interview - Perez was shouting about The Perez Show, so Cami and Chloe started booing, then the crowd joined in, then some of the HM's started arguing and were escorted out for about 15 minutes. Haha.
And there was drama just before the start of the finale about the order the evicted HM's were sitting in the crowd - production wanted them in eviction order and Kavana (and others) refused to be anywhere near Perez and there were arguments throughout the entire show up on that platform. Some of them were apparently trying to get everyone in the crowd to start chanting 'Screw Perez' during a break.