All other images, maps, etc. look good. While hammering out things, it was pointed out that the pipe beast monster wasn't really explained; does it need to be added at the end of Merilla's Tower as a new creature? If so it's in the New Monsters doc.
R16: Page 54 - image is too low Page 75 and 76 - images/maps missing OGL page - may as well update copyright date for BFRPG to 2016 OGL page - need to insert copyright line for Field Guide below BFRPG Page 42 - while spells names are normally not capitalized, in this list it looks weird not to be Insect Valhalla - does a note to see the Field Guide need to be with each entry/encounter, or can it just be a one-time note at the beginning like most adventures do? Pages 5, 8, 9, 10, 13, 17, 19, 21, 22, 41, 43 - magic items are bold but not capitalized
Missing images are a constant battle with Libreoffice, I'm sad to say. You have to use the F5 dialog to find and reactivate them. I went through on R16 and gave them all meaningful names so I can find them more easily.