Other mistake: Ava previously borrowed a razor from another inmate to tidy up her unevenly-hacked hair. All well and good, except especially when seen from behind her hair has been perfectly bobbed and tapered, hardly possible doing it herself in a prison bathroom with a razor.
Continuity mistake: The first time Boyd speaks with Ava's uncle Zachariah, the door behind Zachariah keeps switching between open and closed between shots.
Raylan Givens: If you're going to talk, I'll put you in the trunk and drive myself.
Dewey Crowe: I can't drive handcuffed to the damned steering wheel!
Raylan Givens: You'll get the hang of it.
Question: Mags poisons herself with the same "it was in the glass, not the jar" approach she took with Loretta's father. But we see her grab two glasses - one from the cupboard and one off a shelf. Does she slip poison in while off camera, or is it just that the cupboard/shelf glasses are always poisoned, trusting that everyone knows not to use them? Seems like a crazy risk to take.