I encountered these dialogue bugs yesterday during this quest:
1. The Otter ringleader of the kidnappers you fight in the dungeon does not use dialogue that is on the subtitle card. I did not hear exactly what he said, but he did mention something about Fort McMurtry and he definitely doesn't sound Marleybonean.
You may want to cross reference this with any other reports of bugged voices in quests related to Fort McMurtry.
2. In the dialogue section where Bonnie Anne lets you know how she feels about the kidnapping, Sarah Steele is silent during her speaking parts.