I love the Troy and Britta pairing. I'm actually a little disappointed that it hasn't been explored further in the second season. The two characters have awesome chemistry which makes them all the more perfect for a dance routine. And let's face it, it is a perfect opportunity for Donald Glover to show off how incredibly charming he is. Annie's reaction to their chemistry makes it all the better, especially since she was my least favorite character of the first season. Because of this episode, she started to grow on me.
For Jeff's plot, the gang's reaction to his announcement with Professor Slater was very funny. It makes perfect sense that Abed would see her as his new mother figure, and that sparked the start of Shirley's subtle obsession with different kinds of cheese. Overall, the main plot was incredibly charming, and the smaller stories running with it were lovely as well.