Found a couple more bugs:
Seems you can trigger the lake boss fight again if you go back down to the picnic spot. You proceed through the whole battle and the scenes afterwards, but the game got stuck in a blackout after choosing a skill from the demon chick. (I chose Improved Rape this time, and the game isn't frozen, it's just that no map comes up after the fadeout... you can still access the menu, and you do actually get the skill from the demon [although that might not be the case if you choose Flirt again, or you chose Improved Rape the first time.])
Also, I'm not sure what happened, but either Hinata's ability to heal gets removed by an event, or it never gets added. I got her to level three beating the boss at the lake, and it said she got the heal ability, but I didn't try to use it until I'd been to the town, talked to people, slept with both shopkeepers and went back to the lake, so it could be something in town, but my guess is that Magic doesn't get added to her skill menu (either in this release in general, or where it would be added is blocked by the events triggered by winning the boss fight.
::Edit:: Loaded a game from after I got Hinata to level 3, but before I went to town, and she's still missing the Heal skill, so I'm giving more credence to the idea that the skill never gets added. (Though I'm still not sure if it's the a general thing, the boss fight, or some other unknown cause.)
::Edit2:: Just did some grinding on another save and got Hinata to level 3 on some standard enemies, and the Magic menu doesn't get added that way either. Also thought about it for a second and realized that Cream has a Magic menu to begin with, despite having no magic skills, so the problem is probably just that Hinata's magic skill menu is omitted in this release.