If EvilNina (ie the one in charge of massive dynamics) is a shapeshifter, then she would have had to replace OriginalNina (ie the one in the dungeons) after episode five because the shapeshifters 2.0 didn't sort out their bugs until then (and TransclucentNina would have given the game away).  This is just possible as…

Did anybody else notice that if what Walter says was true, Peter's mother killed herself *before* Walter brought Peter back from the other side?  In other words, Peter's drowning in Reiden Lake is *not* the Point of Departure between the Amber and Blue verses.