Tonight’s new episode is called How Your Mother Met Me, and shifts the focus to Cristin Millotti as the titular Mother-to-be. It’s a flashback episode, one that inserts “Mother” into all sorts of almost encounters, near-misses and fleeting contacts through the years with Ted (Josh Radnor). Think of it as part Rashomon, and part Zelig. Either way, once again, the final-season narrative refuses to move forward.