My favorite parts, especially in the '92 one, were the very, very rare footage of '89 mini and training camps, as well as sideline footage/conversation during some of those '89 and '90 games, stuff you never see.
Additionally, I got a kick (no pun intended) of Irvin explaining his 1st touch down reception in the first Super Bowl against the Bills and why he kicked his leg out to try and block Nate Odomes from intercepting the ball (Irvin had broken off his out route too early according to him because he was so excited about being in the game).
One other thing I learned that I was not aware of previously was that Irvin had gone to Harper's WR position on that 4th quarter play in the NFC Championship where Harper ends up catching the slant/post for the long gain that essentially clinched it. He explained that that particular play called for a curl route by Harper's receiver spot and a post for Irvin's spot. All day Aikman had thrown to Harper running the curl on that play so Irvin said he wasn't going to let it happen again. However, the Niners come out in a blitz formation, Aikman reads it, and correctly ID's the slant/post as the hot route and throws to Harper, rest is history!