Wendy mentions that she once dated Token. This happened way back in "Raisins".
Cartman: You know, Butters, love is just like taking a dump. Sometimes it comes naturally, and sometimes you need to give it a big slimey push.
Game of Thrones:
When Mr. Garrison begins his discussion about the Greeks and the Romans, he then launches into talking about the popular HBO fantasy series Game of Thrones. The series details a bunch of families fighting for the claim to rule over the seven Kingdoms in the land. It is based on a book saga called A Song of Ice and Fire by George R.R. Martin.