Outside of Shaden, a cave on the Armun-Roth Roryn border, there's a kagouti den. And in that den there's a skeleton with an arrow through his head. In his inventory he has a vanilla key to Vivec underworks.

The skeleton should be replaced with a different one.

At the deep end of the tunnels of the mine, at the location in the screenshot, when you get into the water and begin to swim, you cant get out without levitation, waterwalk or tcl.

Probably not intentional.

Character is a redguard-man, if height is an issue with these things.

The NPC TR_m4_Arv_UvaynGuard3, involved in the Arvud quest https://en.uesp.net/wiki/Tamriel_Rebuilt:The_Visitor_Known_as_Vendel_Oth..., is supposed to run after the player, forcegreet them once and then disappear after cell change, but the current script keeps enabling him over and over for some players, which causes the guard to relentlessly stalk the player.

Instead of handling all quests in "Orders" topic, each quest should have its own topic like in vanilla quests.

"Non-members pay 25 drakes." is repeated twice