One more errata - On page 54 - table 15 it says a Sestertius is 3 as, yet both the other lines work out as 4as.
I've also noticed a few historical oddities, like Legion makeup is usually thought to be 10 Cohortes, each of 6 Centuries - but page 81 shows 6 Cohortes, each of 10 Centuries. (Maybe to allow them to be commanded by the 6 Military Tribunes which are normally thought to not have been used to command sub-units of the Legion normally).