The gap between the top floor and the stairs in the Imp_SetNord_I_Lighthouse set is impossible to walk through without tcl. I've attached a screenshot of the gap I'm referring to. Models are tr/i/tr_in_nor_lh_03.nif and tr/i/tr_in_nor_lh_04.nif
The manequinn plays dead pose animation instead of standing still like in original Morrowind. The location I found the bug at is -- Ebon Tower, Legion Headquarters
For a large number of shirts, only the SD (256) textures exist in version 8 of Tamriel_Data, which does not look very good in a HD settings. Notably, the very same textures exist as HD (1024) versions in version 7. Apart from the resolution, I see no visible difference between the two versions, although I guess there might be some subtle changes. My conclusion is that the one who made those changes to the SD versions forgot to provide high-res textures.
The mesh associated with the window type T_Imp_SetMw_X_2Window_01, TR_X_Com_2Window_01.nif, does not have support for Glow in the Darkh. I think the reason could be that this was missing in Melchior Darkh's original patch for Tamriel Data.