Honestly, I thought the biggest differences between the halves was the offensive line and defensive play.
In the first half, we had (what seemed at least) to be a lot of 2nd and 3, 3rd and 2 type of situations.
In the second half, there were at least two third-and-18's, and seemed to always be third-and-more than 8.
Also, our red-zone offense is atrocious (never should have gone for 2, no matter what yard line it is), and the Eagles' offense was more shooting itself in the foot in the first half than we were stopping them. Once they stopped fucking up they started to score.