I'm not sure if I would call these significant discrepancies or not but...
Changes
I’d upgraded my summoning circle, which was set in the concrete floor at the far end of the little room, a five-foot hoop of braided copper, silver, and iron that had set me back three grand when I ordered it from a svartalf silversmith.
Peace Talks
My old copper summoning circle had survived, somehow, at the far end of the room. Maybe the floor of my old living room had collapsed over it, shielding it from the worst of the flames.
And in The Law; part 6 (chapter 8 of the audio book) Harry says he hasn't rebuilt his summoning circle yet.
So which iteration will we see in Twelve Months?
Should the Betas have caught this?