More brilliance when it's revealed that Callie can read Aramaic: it was used not only as a language of divine worship (lampshading her status as bringer of the end of days) but as a language of the administration of empires, befitting her role at the department of integration.
That demonic manufacturing plant from when Mark and Callie took his group on a tour of hell. Given the high mortality rate of demon culture and the fact that they don't appear to have all that high of a birth rate, they NEED plants like that.
Fridge Logic: Callie was shown in previous episodes to be a shapeshifter, why would she need surgery and hormones to become "Dick".
Maybe she can only turn into female forms?
Expanding on the above, Callie is only half demon, so it would make sense to limit her abilities in that area.