I found a minor inconsistency for someone to note for a later erratum.
On page 7, it says this: "Sakuachi bears a magical rune which her elder Seshu glimpsed in a dream and inscribed on her palm for protection. (What Sakuachi doesn’t know is that this rune is the exact same mark shared by all gatewalkers, including the PCs.)"
On page 22, it says this: "Thanks to the magic of the rune on Sakuachi’s neck, he can see into her dreams as well, even though she isn’t a gatewalker."
I'd imagine the fix between palm and neck would happen on page 22, but that's for someone else to figure out. It might also be mentioned one or the other elsewhere in the adventure.