That Cartman answers for Kenny sets up a joke only people who've seen the Spirit of Christmas: Jesus vs. Frosty will recognize, but I'll tell you. In that short, when the fat boy dies, the boy who became Stan says, "Oh my God, Frosty killed Kenny." Later, the hooded kid dies without comment. Here, the substitute, not knowing better, calls Cartman Kenny.
Butters ends up being a singing telegram. He'll resist more than Pip does, but he'll do as he's told in the end.
"Miss Information" — misinformation. It's fascinating, the amount you get from her.
One of the toy spacecraft Cartman and Kenny are playing with is a miniature of the one that heads for Earth at the beginning of "Spooky Fish." The alien from that ship is also there as a toy. Cyborg Bill, from "Chinpoko Mon," is also there. And so is a generic version of the Missionary 600 from "Starvin' Marvin in Space."
Cartman's song is "Comedy Tonight" from Stephen Sondheim's A Funny Thing Happened On The Way To The Forum
Why is it that Stan can see that all is clear for them to enter the house, but we can't see anything through the windows when the front door is opened?
The reason Kenny got so mad at Stan is that Stan was preoccupied with Kyle's possible death, while Kenny dies almost weekly without anyone being so preoccupied.
E. P. Garrison??
In The Valley Of Penises — Spoofs Beyond The Valley Of The Dolls, the X-rated 1969 movie for which Roger Ebert, movie critic, wrote the screenplay. Trey didn't much care for Ebert's review of South Park: Bigger, Longer, & Uncut, citing Beyond The Valley Of The Dolls as a reason Ebert should have been more positive in his review.
The attitude towards holistic medicine shown in the episode can easily be tranferred towards Christian healing beliefs (like those in Christian Science) by simply changing the vocabulary, and the outcome would be the same.