One important thing is when you recruit Minthara DO NOT ASK HER ABOUT SHADOWHEART!!!!!!!!!!!!!!!!!!!!!!!!!!!!! She spoils the end of SH's story for the end of Act 2[i][/i][u][/u]
It spoils one possible ending...since you can, of course, still make the opposite choice during Shadowheart's personal quest.
Hopefully the developers are aware of these bugs, especially when they spoil things like that.