One thing that I noticed during that great game was how well the Eagles wrapped up when they were tackling. That was part of the reason that I think that they were able to do well on Barber. Obviously it helps to stack the box, but most teams did that the last couple of years when he was running late in the game, and he would break tackles for big gains. The Eagles were very good at keeping hold of his legs and ankles, as well as on the other Cowboys. If nothing else it gives time for someone else to come in and help.
Another thing I noticed was that most of the Cowboys seemed to tackle high. I think that's why they had so many facemask penalties, and probably should have had more. I think this is an unfortunate side effect of not having full contact practices in the offseason. Maybe part of it is trying to avoid horse collaring?
Is there a way for an NFL team to improve it's tackling during the season? I know that you definitely don't want to have full contact practices now, but I think the Cowboys need to work on tackling guys lower, especially from behind or the side. I remember practicing breaking down and wrapping up on the dummy in high school, but that was from straight ahead. It's hard to simulate tackling while chasing. 15 yards and an automatic first down is just a killer every single time.