Cartman says he wishes he was at home watching "Fat Abbot cartoons", Fat Abbot is their version of Fat Albert, the name is almost identical and both are cartoons.
The tribe that kidnap the kids and the choir teacher tie her up in a way identical to the woman in King Kong, a giant King Kong-like monster then appears from behind the bushes in an almost identical shot-for-shot re-enacting of the scene where the woman is offered up to Kong in sacrafice.