Continuity Nod: In the montage at the end, the narrator explains that Stan held a seminar about boredom and when it failed, jacked off in San Diego, a nod to the previous episode "Butterballs".
Despair Event Horizon: The boys are stranded at sea, Kenny dies of boredom and herpes and it's revealed Stan took them on the trip so he can get an iPod Nano.
Fake-Out Opening: The opening scene makes it seem like the boys would get into bloody ziplining accidents. As the episode continues, it becomes clear that there were no accidents — the ziplining was made significantly less fun thanks to an insufferable tour group.
Hypocritical Humor: Cartman mocks Kenny for having herpes and saying it's a cold sore. At the end of the episode, after being treated for herpes, guess what Cartman says?
Long Title: At one point, the documentary is renamed "I Should Have Never Thought Horseback Riding Would Be Any Better Than Ziplining".
The Millstone: One same irritating camper is constantly halting the group, arriving half an hour late to the trip and constantly asking questions to the guides. The narration makes clear the boys are really holding themselves from telling this guy to go fuck himself.
Snap Back: Cartman's back to insulting Kyle for being Jewish.
Toilet Humor: Most of Cartman's scenes. Especially the live-action version of him crapping on the side of the boat.
What Could Possibly Go Wrong?: Stan says this line when he decides to go on a boat ride instead of enduring horseback riding any longer. This also cues the switchover to the dramatized footage.