Right, because there is no possible way that could just be a typo....
While it COULD be, I don't think it is. If lantz claims it's a typo, that still makes the 'Oh, only 24 guards aren't enough' thing reaaaally suspect. Especially considering these facts that lantz has stated -
A) Only one entrance to the compound
B) A large courtyard, easy enough for a couple guards
C) Only thirty fucking rooms in an apparently skyscraper sized castle.
So either Lantz cannot into scale, or Lantz is trying to bullshit things into going his way. I'm guessing the second.
There's also the fact that if that IS a typo, it's been there for over a month.