Just did "Night of the Comet", and noticed the bridge artwork behind Admiral Ross of the U.S.S. Reuben James is wrong. It's showing a Galaxy-class bridge, should be a TOS-era bridge.
Romulan displays are upside-down. I noticed this first in the Warbird bridge ready-room, the large display that pops up near the desk. You can tell it's inverted by the Romulan insignia in it. This particular artwork is used in many places, same problem.
Romulan ambassadors on ESD and Qo'noS need Romulan-specific dialog when giving out "New Romulan Aid" mission. The speech they give to Romulans is the same as for Federation and KDF, and doesn't really fit. The dialog for the arrival on New Romulus wad adjusted for Romulan captains, just need something equivalent here.
The bridge issue goes further than that mission;
Romulan Star Empire NPCs (Charva, for example) are shown on Romulan Republic bridges with Republic crew.
If you're in the Sirius or Regulus blocks with a Klingon character, then it's not uncommon for officer messages (permission to warp to another sector block, for example) to also show a Galaxy bridge.