Manumnabi (cave involved in this quest: https://en.uesp.net/wiki/Tamriel_Rebuilt:A_Champion_Lost) is pretty much impossible to climb unless the player has a high acrobatics skill. Seems like bad design rather than an intentional skill check.
"Catcatching in Almas Thirr" quest offers an option to lure the slaver to Majordomo's Sanctum, where he gets arrested by a unique Ordinator. With the Sanctum refit merged, the room where he gets caught is restricted and has a 60 lock. The related PositionCell coordinates and the position of the quest-related Ordinator should be adjusted to make it happen upstairs instead.
Volenfaryon generic dialogue and quests have a number of major issues. I initially planned to release the fixes together with https://www.tamriel-rebuilt.org/claims/armun-ashlands-volenfaryon-questi... claim, but figured that it will be quite hard to review combined with the new content, so I decided to implement the fixes separately.
The dialogue for the "Vintage goya" topic (present in the Ando HH questline) is wrong. It says that it's a fine Cyrodiilic liquor. It's actually a fine hlaalu-made liquor (a native counterpart to flin/cyrodiilic brandy).
If the player enters the locked room on the 1st floor of Aurelia Draconis' House in OE, the game improperly starts the FG quest "More Rats?" at stage 30.