The first call, the replay equipment didn't work.... therefore the referees could NOT have overturned the call on the field, which needed conclusive evidence to be overturned.
The second, was blown dead as an incomplete pass by a guy who saw what he saw. He is one of the better referees in the league, and gets the tap when Superbowl comes along, and admits he made a mistake, that his view of the play was wrong. Unfortunately for the Chargers, this killed the rest of the play from the blowing of the whistle for an incomplete pass, and placed the ball at the spot of the foul.
The refs got the calls wrong when we have the luxury of slow motion replays. They got them right when applied to the rules of the game. No conspiracy, just a single spot of human error based on what he thought he saw, which, I can honestly say when watching that play, I thought I saw as well. I didn't see it as a fumble until the slow motion replays ad nauseum.