Since Pretty Little Liars writer, Andy Reaser loves playing around with Mona's code, could the tail end of this tweet of his (complete with a behind-the-scenes shot of Ezra) actually be another hint in disguise?
Welcome to Instagram, actuallyharding !!!! put aria's puzzle away instagr.am/p/RolAwWuBCD/
— Andy Reaser (@AndyReaser) November 5, 2012
"Put Aria's puzzle away" is pretty cryptic to stand on its own. And if we apply Mona's code, the end result would actually be, "Papa".
Lucy Hale (Aria) implied in a recent interview that it might be possible that Ezra's son isn't actually his son. Could that be what Andy's hinting at here?
Source: Andy Reaser via Twitter