When you go to Nettie through the Underground Passage instead of the 'normal' route you come across 2 annoying bugs.

1) When you go from the room with the dead drow to Nettie and you open a crate in Nettie's room, Nettie won't go into the room with the dead drow and you actually have to steal the Wyvern poison.

2) In the Arabella cut scene if you miss your Barbarian intimidation check, they immediately want to toss out all the Tieflings from the grove. The druid fight starts. A bit of a harsh response because you only wanted to save Arabella.