Okay, this was a brilliant episode all around... The writing, the acting, the directing, the producing... Everything. *SPOILERS*
The flashbacks seemed to focus on the idea of choice. They showed Reese and Kara working together in Paris and Prague and some choices Reese has had to make. They reveal no grand revelation, but aid in Reese's character development substantially. The replaying of the Ordos flashbacks (Matsya Nyaya) was a bit tedious for us die-hard POI-ers, but I didn't mind.
The episode itself was brilliant. Reese told us so much in what he told Detective Carter, and the story arc was excellent. And as per usual, it was brilliantly acted all across. Lots of twists and turns, great music, and the Fusco side-storyline, which served as the much needed comic relief was hilarious. Overall, excellent episode and runnerup to only Many Happy Returns... 9.5/10.