My issues with it as soon as I read it the first time are outlined below.
The Tomb of Moving Stones layout changes. Still make no sense. If the sinkhole is in 'the middle of Red Larch' and we use the map as is, then the moving stones room is 300 feet east, way further than Waelvur's. Much better to have the moving stones chamber at the far north of the map (ie rotate the map 90 degrees) and flip the secret passage (Mellikhos) to head west and the other entry tunnel at the south end with the sinkhole (Waelvurs) east. The Waelvur's entrance can be discovered via Stannor Thistlehair, so if that leads directly to T9 as erratad, rather than T1, the suspense of that entire duingeon is lost.
The missing Knight's body. Like - WHY? and HOW? would have been nice. Renwick owns that vault, any cultists going down there would have been massacred. Unless he ordered the body from Hellenrae specifically as part of some deal. But that sarcophagus is meant to be for his brother? Not some random knight.
The missing bits in the Long Road side trek - that side trek is dull as dishwater, how about adding back in the bit that was clearly supposed to be in there, instead of ignoring it.
The Eternal Flame Warriors encounters need to be rebalanced - Eternal Flame Guardians are much higher challenge than the other cult minions, an encounter 2d6 of them plus a priest is possible in the Early Travels section. Really? Obviously a DM will fix that for his or her game but we buy printed adventures so as NOT to have to do that, surely?
To me, they got someone to quickly knock together an errata when a little more thought and revision would have made things much better! I still love this campaign. Much better than Tomb of Annhilation
