Continuity mistake: Whenever Amon is on screen with his mask, the design of the mouth keeps changing: sometimes there are circles on the end of it, and sometimes there is a small angle pointing up. This can be spotted, for instance, when he is talking at The Revelation.
Continuity mistake: There are several inconsistencies between the last scene of the previous episode and the one recounting it in this episode: 1) Korra is jumping up and down when she says "Is that all you got?" in the last episode, but in this one, she's standing still, 2) Korra collapses after the line "We have a winner!" is heard, instead of before like in the previous episode, 3) Korra's bag changes design, from a grey duffel bag to a green backpack.
Continuity mistake: General Iroh attacks a squadron of five combat planes belonging to Amon. He downs two immediately. One fires back and ascends. At this time, the face of the pilot is shown. The other two descend. Iroh follows and destroys them. At this time, the ascending plane drops bombs. Again the face of the pilot is shown, but the pilot is a completely different one. The first time, he has a taller face, thick eyebrows, a pair of round and brown-tinted goggles and no mustache. The second time, the face is rounder, the eyebrows are thinner, the goggles are rectangular and pale, and there is a mustache.
Plot hole: Guards at a security checkpoint attack Varrick and Bolin, because a wanted poster identifies them as fugitive traitors. The problem is that poster cannot have been there. Varrick and Bolin escape in the previous episode (Battle of Zaofu) but are captured minutes afterwards. (So, no posters needed.) The next day, they escape again by blowing up their imprisoning train car. Their captor, Bataar, thinks they are dead. Indeed, Varrick intended to die. Later, Bataar is actually shown reporting them dead. One might argue that the poster wasn't a wanted poster, but one that warned people about the empire making an example of the traitors.This argument is too flawed: The empire had many examples already, some very high-profile. And a propaganda poster must be placed in plain sight, not in a security booth corner especially designated to let security guards compare the passing individuals.