If returning to Qyntos Mor's house after finishing the OE quest "Imperial Legion: Jury and Executioner", and having resolved the quest by arresting Qyntos and saving Lucia's life, Lucia will again cry for help as if the hostage is still going on. There is apparently a missing speaker condition for Greeting 0.
The beneficient effect of Locutius Family Liquor, recieved as a reward for the first OE Fighter's Guild quest, is Restore Willpower, 50 pts for 60 seconds, which certainly not makes any sense to me, especially when comparing to other liquors. I think the intended effect is Fortify Willpower, so this should be changed accordingly.
During the temple quest, Outlandish Heresy, Nerasa Veran's dialogue is "No, I don't believe you. You're just a lackey. Go speak with a Temple Master or a Patriarch in Mournhold district. Tell them what I want." It may make more sense for her to say "No, I don't believe you. You're just a lackey. Go speak with a Andor Orothi. Tell him what I want." As he has the relvant diolgue option for the quest and is the nearest relevant temple master.
During the mainland temple quest, Outlandish Heresy, Lloris Dalan the quest giver in Almsas Thirr refers to a characters death using the wrong gender. If you kill Citriel, the Bosmer merchant, Lloris will say "his death" instead of "her death".
EDIT: version 2 -- segmented the instructions better. Now vanilla and OpenMW are totally separate and Optional mods are found in the end of each instruction set, where they hopefully don't overwhelm the reader.
The installation instructions provided in the latest readme file were outdated, due to the switch to the new BAIN folder structure. Also, so many people now are using OpenMW that it seems prudent to include instructions for it. Here is the rewritten section II: