So how many people have actually used stuff from Occult Lore as PC's? That 's really the only way to figure out all the errors and inconsistencies.
One of my fellow players is currently looking through the Alchemy and Herbalism sections, and is somewhat dismayed at the seemingly random craft DC's and prices of various concoctions. Things like a "Gentle Repose" herbal preparation being only DC 19 and 220 gp and lasting forever (compared to a scroll: 300 gp, takes a feat to create and only lasts 3 days), whereas willow tea has a craft DC of 30, costs 45 gp, and all it does is remove 4hp subdual and fevers.
I've had the same disconnect with the Alchemy&Herbalists book: I hear a lot of DM's raving over it, but when I actually try to use it as a PC, it's just chockfull with inconsistencies and completely out of line with any other alchemy resources.