I don't think the NFL fixed the game, but I do think it is quite possible that most if not all of the refs got together and pooled some money and made a big bet on Pittsburg to win (and cover). It would be very easy for them to do, and who would ever know? Many of those calls were very questionable and the fact that every close call went against Seattle is highly suspicious.
Ummmm THAT'S THE DEFINITION OF FIXED.
Every close call did NOT go against Seattle. I'll be happy to name several if you need me to.
As for refs making sure Pittsburgh won and covered, it's ludicrous. For all they knew, Pitt could have come out and played a horrible game, Seattle could have played a great game and it could have been a Seahawk blowout that no amount of "bad" reffing could fix. I think you've been reading too many Dan Moldea books.