There were multiple GIANTS injuries that stopped the clock, and allowed substitutions, and disrupted the cadence of the no huddle. All the giants players made a miraculous recovery, and continued playing the game. It was legal, but not 'in the spirit of the game', as Bill Polian said afterwords.
This of course, led to the competition committee instituting the two minute rule of the loss of a timeout due to injury. The game essentially, was Belichick's first 'perfect cheat'.
That being said, the Bills simply should've ran the ball down the Giants throats for the entire game, which they were doing a pretty good job of. 135 yards on 15 carries for Thurman. 190 yards from scrimmage.(5/55 rec.) (9.5 yards/touch)
The Bills were not outclassed, but certainly out-coached.