Every game brings about a situation where you have to learn what the other team wants to do, what your assignments are, what you need to look for pre-snap, etc. Doing that over a 4 week period (?) is certainly easier than doing it in 3-4 days. So, that helped mightily I'm sure.
But, the fundamentals looked completely different/better. They looked cohesive, and while understanding the defensive schemes you'll see helps, on an offensive line that also requires good fundamentals and working together as a unit. I'm pretty sure HH took them to the wood shed over the last several weeks and worked extensively on their fundamentals and chemistry as a unit. It showed.