One thing I noticed is a weird discrepency in the Demilich errata.
It was changed from 80 (20d4) to 80 (32d4), which would make sense for the 2.5 average of a d4. The problem, however, is that the Demilich has this annoying sentence, that it seems they didn't axe: "Undead Nature. A demilich doesn’t require air, food, drink, or sleep. So great is a demilich’s will to survive that it always has the maximum number of hit points for its Hit Dice, instead of average hit points."
So either someone "corrected" a non-issue, or the Demilich is now supposed to have 128 hit points.