The Undertaker was released from hospital on Monday, after being help overnight for a serious concussion. He was walking around in a lot of pain, but he has been doing so for a long time now. The concussion occurred during the early stages of the match, perhaps during a take-down by Brock, which is why the quality of the match might've not been as high as usual.
While the match itself, we received word that the bell didn't ring after the pinfall leading to the Live Crowd being very confused, thus the lack of reaction. Everybody in the building thought it was a botch or screw-up, as did many of us live.
There has also been alot of word on the finish being a "shoot" and different from the script. This is not the case whatsoever, and Dave Melzer reported that people who needed to know, knew about the finish at around 3pm before Wrestlemania XXX. Obvious people needed to know to create the graphics for the "21-1" font and video packages on RAW the next night.