The rope-cutting challenge. In this challenge, players systemically eliminate others from the competition by cutting their ropes upon answering questions right. Intuitively, players will target the people they do not want to win Immunity first, essentially announcing their targets to evict from the game next. Then they cut off the ropes for their number two threat and vice versa. If a player does well enough, they don't target a couple people, and it's pretty easy to assume that the people they are not targeting are people they want to win immunity. Essentially, it's a trap to force players to reveal their targets and alliances, and this was what sealed the fate for John's alliance in Marquesas, because Vecepia, Pascal, Kathy, Neleh, and Sean saw them get eliminated and immediately realized the four were in an alliance.
Chase and Sash's decision to eliminate Jane over the easy-to-beat-Dan was actually Fabio's idea; Chase and Sash had just made it their own. When Chase and Sash mistakenly told Jane they were voting her out to her face, Fabio was smiling at this because he essentially tricked them into revealing their alliance.
The blindside of the Four Horsemen in Fiji was an amazing plan was actually brought about in part by Fridge Brilliance. Dreamz had told the other five that they had the idol and that Alex or Mookie was going to play it so they would force the others to lose their advantage. Stacey and Earl then suggested they voted for Edgardo, since their plan was expecting the five to vote for Alex or Mookie since they knew for sure that Edgardo wouldn't play the idol. They then decided not to tell Dreamz about it so he would think they were voting for Mookie; so a throwaway vote was cast for Mookie while Edgardo was voted out in a 5-3-1, making one of the most epic blindsides ever.
In the time when alliances were unethical, Sean's "Alphabet strategy" actually isn't as stupid, since his Alphabet strategy basically meant that most of the Pagong tribe would be the first people he voted for; so essentially he wasn't making any alliances.
If one looks at the cast for South Pacific, they can see that the cast has a lot more Ascended Fanboys/Ascended Fangirls than previous seasons. Why? Well, this season was the first one to be filmed after Purple Kelly and NaOnka quit in Nicaragua. Given the uproar that the double-quit caused among the crowd of people that enjoyed the show and had been applying for it time and again, it's very likely that this is the producers' way of apologizing for the quitting.
Whenever people quit and don't commit Suicide By Cop; people generally really hate you. A lot of people agree with Jeff that it's very rude to just "quit" because you "can't take it anymore" like Kelly and Naokna did.
Say what you will about Fairplay, talking Sandra and Lillian into voting out Darrah over him was actually a very good move for him to get into the final two. Anyone who had seen the show by that point (or had sat through a couple complete seasons) would have known the final immunity was always an endurance challenge; and aside from himself, Darrah was the most physically fit to win that. So by getting rid of Darrah, he would compete for final immunity against a scoutmaster who would constantly screw up and was at the time 51 years old and a woman who hadn't won a single challenge all game and wasn't physically strong. And that's what made Lillian's come-from-behind final immunity so much more of a Crowning Moment of Awesome, since nobody expected her to win an immunity challenge.