It's also a short week before the holiday, many skip Mon/Tue classes to get home to their family sooner. Not sure if it's enough to explain empty seats, but I did drop my cousin off at the airport last Saturday for this very reason.
I don't know how it worked before, but she got a friend to transfer a ticket into my name and it took about all of ten minutes on my iPhone to get it purchased online and printed for the PSU game.
On the topic of things lacking, I do think that Memorial stadium doesn't get as loud as it could, at least not that day nor consistently every game. I know there are many factors. But my take that day was that the place erupted after the opening drive of the second half to the 3rd down conversion completed by PSU, the play where Ciante's helmet broke. The sack, pick, and TD in between kept up the volume until that conversion, but the rest of the game never got that loud until the game was finally won. The student section is on their feet the whole game and gets loud before every play. Not saying other sections/people don't, but collectively the stadium doesn't rock like it could. I understand why TO moved the student section, but some fans are content with being at the game, which is fine because it's awesome seeing couples featured who've been to every home game in the past 40 years, but pound for pound the student section represents for that stadium.