At present there is not any way to check secret counts for a given area, though I have that planned as part of an "Atlas" (companion to the Bestiary) that will show a variety of map info, such as treasures, secrets, etc.
You're right about the Harpy's dialog! I'll probably change that line to "dark-haired" or something along those lines, since it doesn't quite make sense with the character's color schemes (I also like having the siblings' color schemes inverted, so that definitely won't change!)