SPOILERS BELOW (although you shouldn't even be reading this messageboard if you're planning to play the adventure)
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(1) The "Lair of the Architect" map seems to contradict the description of area 11. According to the description, the nutrient basin is on the west wall of the pillar. But according to the map, it's on the north wall.
(2) Filge certainly managed to assemble quite the necromantic laboratory in less than two weeks. And he doesn't appear to be taking much trouble to stay hidden, since "Flickering light filters through the observatory's only windows."
(3) What exactly does a Talisman of the Sphere look like? The DMG describes it as a "small adamantine loop and handle." Is the handle wooden? How long is the handle? Is the loop open or closed?
(4) Are the PCs supposed to encounter Tirra in the Feral Dog in this adventure, or is that supposed to wait for a later adventure?
(5) Gricks can burrow?
Overall, though, this looks like a really good adventure. I'll be running two concurrent Age of Worms campaigns, and I'm really looking forward to getting started. Great job, Erik, and everyone else who was involved!