It is revealed that following The War in the original series, Katara was responsible in making Bloodbending illegal.
It is revealed in this episode that Amon is the eldest son of Yakone, and thus Tarrlok's brother. It is also revealed that Amon is actually a Waterbender and a Bloodbender and his real name is Noatak.
Bolin: (after seeing the war planes flew by) Where does Hiroshi find the time to keep inventing new evil machines!?
Korra: So crazy. A few months ago I was in the South Pole practicing for my firebending test and now I'm in the middle of an all out war.
Mako: I know. We didn't even know each other then and now I can't imagine my life without you in it...You're the most loyal, brave and selfless person I've ever known.
Korra: (while blushing to Mako's remarks)I think you're pretty incredible too, but you already knew that. ....(after resisting the urge to kiss Mako)I should probably try to get some sleep
Mako: Me too... good night.
Korra: Good night