Also glad for Don. There is more of his story they alluded to throughout the season (in the flash forwards) but I guess they have dropped those.
I also enjoyed the 9/11 retrospective and how it fitted into their stories.
I felt like they must have learned they were cancelled AFTER they filmed this 'season' finale and they went back in and punched in a few things. It totally felt like afterthought stuff and, of course, left a lot of stuff hanging.
I also would have loved to see some major come-uppance for Arroyo. I couldn't stand that guy from minute one. At least there was that he didn't get that promotion that he (and only he, no doubt) thought he deserved.
It's been several days since I watched the finale and I plan to bring it back from my deleted folder and watch it again soon. Knowing me these days, I missed some stuff.