A couple of things I noticed about the stadium that I haven't seen posted elsewhere:
On the West side of the stadium on the inside of the concourse (between concessions and the new wall that runs along Main Street) there are murals up on the wall with information about each of Michigan's National Championship seasons.
Also, cut into the stone on the insides of the bases of the arches you can see from the exterior are the names of all the Michigan counties. (I just looked on Wikianswers, there are 83...) I don't know if those are the only names cut into the columns. When we left the stadium, we went out through the tunnel, then looked back in to the entrance for the East Side tower -- there were more county names there.
Finally, you can't even appreciate how beautiful the brickwork is until you're up close. Occasionally, you'll see details like a Block M in brick pattern relief. It is all very cool and makes the stadium look so much more impressive from the outside.