Cliff Hanger: Black Friday gets moved from November 26th to December 6th to make way for the saga to continue two weeks later (there wasn't a new episode the following week so they can show "A History Channel Thanksgiving" for the holiday).
Empty Promise: Parodied with George R.R Martin, who constantly torments Butters and Scott with the promise of dragons in Game Of Thrones, and later can not even hold to the promise of delivering a simple pizza (which he similarly hypes vigorously).
Reasonable Authority Figure: Steve Ballmer seems to be one of the few sane adults in the world. He doesn't consider the console wars to be that serious and remains calm and collected despite what is happening. He gets killed by Bill Gates for not treating it like a real war.
Running Gag: Cartman talking about betrayal in the old man's garden, with a different companion each time.
Serious Business: Played straight concerning Black Friday, however Steve Ballmer subverts this regarding the console wars, not taking Cartman's melodrama seriously at all and wishing to maintain an adjusted impersonal business. This defiance of Serious Business gets him mortally wounded by Bill Gates.
Shown Their Work: During the "Wiener Chorus" scene, George R.R Martin mentions how Joffrey dies of poisoning, an event in the books that, at the time this episode first aired, had not yet taken place in the Game of Thrones TV series.
Special Edition Title: A slightly modified version of the opening sequence is shown, with the theme song replaced by an epic theme with the kids dressed in their medieval outfits.
X Must Not Win: Bill Gates specifically states this concerning the console wars, believing a good natured run where no one necessarily loses is a sign of weakness and even kills Steve Ballmer for defying it.
Zombie Gait: Parodied when Randy informs the approaching Black Friday shoppers that they're not allowed on mall property yet, so the shoppers start walking like this.