The Butters Show theme song reminds me of three other songs, each quite different from the others: "(Everyone Knows It's) Windy," "Sexual Harassment Panda," and "Happiness Runs (In A Circular Motion)."
Studcat Theater — well, there are Pussycat Theaters around, and they are pornographic theaters. Studcat Theaters must be gay porn theaters.
Sign seen at the White Swallow Men's Spa: "What happens in here stays in here!" This is an indirect reference to The Grean Mile, the prison whose motto was "What hapens on the Mile stays on the Mile."
"Locker 213" — a reference to Jeffrey Dahmer's apartment number, 213, Oxford Apartments at 924 North 25th Street, Milwaukee. The apartment building he lived at has been razed so as to erase the memories of the murders that took place there.
The scene at the boat dock is a reference to the Susan Smith case, in which she sent her kids to their deaths by having the car roll into the water with them still strapped in. It seems Trey and Matt are sympathetic to the case and imagined what she and the kids could have been discussing when she sent them to their deaths. And then how the parents could have dealt with the deaths in light of other cases like the Ramsey, Simpson, and Condit cases.
The gas station mechanic and "that road has a lot of history there" comments are based on Jud (Fred Gwynne), from Pet Sematary. Matt and Trey have made references to that movie before, most notably in "Spoofy Fish" and "The Wacky Molestation Adventure."
""Six years ago a group of campers went up there and got lost. Had to eat each other to say alahv." — Cannibal! the Musical reference: a group of explorers lef by Alferd Packer went looking for Breckenridge, but got lost. They eventually ended up eating each other while Alferd was away.
As Butters begins to walk down the dark road, the trees take on an appearance reminiscent of The Wizard Of Oz, as facial features appear on them.
The three laser pinpoint lights on Butters' forehead and the thernal imagery that follows come from Predator, in which Kevin Peter Hall, as the Predator, hunts for challenging prey. Children and unarmed people are non-threatening, so the Predator leaves them alone. And so, Butters makes it out of that road without a scratch.
"One of us! One of us! Gooble gobble! Gooble gobble!" — from the the wedding scene in the 1932 movie Freaks. A woman marries a circus freak for his money, but the other freaks rejoice that she married one of them, and so chant to make her one of them.
"...we learned a very important lesson tonight..." — but the sky is bright and blue out, it's still daytime.
In the apology to the Ramseys, Condit, and Simpson, the camera focuses on each one of them as Chris mentions what the town was thinking about the Stotches when Butters was missing. Thus, we know Trey and Matt's positions on the guilt of Condit (lying about Levy's whereabouts), Simpson (getting away with murder), and the Ramseys (getting away with both).