The repurchasing the book is actually just another bug-- one that I have since patched, and will not be possible anymore come next release. You're correct that it absolutely shreds continuity, and that's less than ideal.
As for Moana's tattoos, you're right on the money as well. Especially considering that she doesn't have the possibility of getting all the tattoos she will eventually have yet, having to go back and edit every image in which Moana's lower back appears is a lot for each update. They will, in time, be visible in all images that they should be-- however, much sooner I intend to release a lore reason (which I've been building up to for a while) for why they are not currently visible, so that those who would rather scenes be more accurate to the game's story (myself included) can have a reason they're missing besides 'the dev couldn't hack it.'