The statements made by Tuck and Osi after the game describe the difference. Its about working as a team instead of individuals because you can trust your teammates and you don't have to try and do more than you are supposed to do. When you try to do more, you open up and expose yourself instead of executing your assignment.
With all the injuries, there was a learning curve in positions manned by younger players. As they started to understand their role better, the game slowed down for them. The addition of Blackburn as many of us have stated was a huge plus. Getting healthy players back was a plus.
Then of course, it's quite clear that Perry Fewell made adjustments and changed some things up, such as going to more man coverage in the secondary. As NYSports mentioned in another thread, it's very likely TC got him back on track.
It's all coming together for the Giants right now on Defense. Hopefully Ross can play next weekend. The loss of an experienced Corner against Rodgers would be a liability for sure. They are playing with tremendous confidence right now and that is a huge plus.