I restarted a new game (no other saves were kept) to play this DLC, so the first place I built a house was Falkreath. Here are a few glitches I've noticed:
-I can't store anything in display cases (no activate button)
-Originally couldn't adopt children, despite having a fully-created bedroom. Was given only the "I've a house, but no room for you" (damn, that's harsh) option. I reloaded the game, and tried again. Worked this time. Not sure what changed between tries.
-Skeevers in my basemant. Okay, maybe this one isn't a glitch, but I
still have skeevers in my basemant. They're not disappearing. I finally had to stack them in the blast furnace.
-Things randomly dropping upon entering the house, especially pots. I built this thing myself, so I know it's sturdy (dragons and all that). Not sure why things are randomly dropping.
So far, that's about it. I just finished up my baby yesterday (fully finished). I'm at level 12, so I'm looking forward to continuing with my new house. Bye-bye Breezehome!
