Hogan seeing the Warrior in the mirror when no one else could, the Undertaker being satan and sacraficing people, the Triple H/Austin forklift incident, and the Black Scorpion's crazy magic tricks.
They were building up Jarretts debut for weeks and on RAW he was supose to wrestle Ahmed Johnson but he refued because he said that he was a star and wanted a star quality opponent. So Commisioner Slaughter came out and said that at the In Your House: D-X he would get his star quality match against the Undertaker.