Before people chime in that it's not a bug, not all bugs are code stuff. Having an Aldmeri banner fly over Daggerfall would have been a bug, too.
So here:
1. There's a Coldharbour map plastered in a few spots inside Ardent Hope. I guess some of the designers just have no idea that "Oblivion", "Deadlands" and "Coldharbour" are not exactly the same thing.
2. Clothing nodes in Deadlands have a chance to drop Coldharbour Glowstalk furnishings. Again, someone has apparently reused the template without stopping to think for a moment.
While these ain't anything game-breaking, they are just one Hell of immersion/lore-breaking...