Haha, you've got a good eye for the details. This was a first-time effort on everyone's part putting this together. In particular, the layout didn't get anywhere close to finalized until...about 3 minutes before the submission deadline. So yeah...unfortunately, there's a lot of fully prepared content that just didn't make it into the layout of the final version.
1. The stat-blocks are one of the things that didn't get entirely finalized. I initially created the adventure with stat-blocks configured for DCC as I'm more familiar with the ruleset. This probably ended up being a mistake though as it's led to some odd incompatibilities like you've noted. The weapons were minorly scrapped, and were intended to be unique items, hence the different stats.
2. I almost fell onto the floor when I was reading and saw this in the submission. Yes...yes they are
3. The spell to fix the hallway can be found in the last run on Bracken's Skull from inside his quarters. Otherwise, it's noted that the false manor lord can be of assistance to the party if they can find him a replacement body.
Thanks for the in-depth feedback on this one! I'm working with my layout designer to make an updated version of the adventure specifically to address these sorts of issues.