Immunity Idols: There will be an idol hidden at each tribe's camp. This idol gives the person immunity. They can play it at any tribal council after the votes are cast and before they are revealed.
Tribe Swaps/Changes: At a random point in the game, the tribes will be mixed and changed randomly. This a can change the game completely.
Tied Vote: In any tied vote, there will be a revote. If the vote is still tied, those who are in the tie are safe and one of the others will be voted out in a random draw (rock draw).