I just love how the show played Now-You-See-It--Now-You-Don't when it came to the mirrors at Collinwood.
In Ep #1035, quite obviously the mirror in the foyer is not where it normally is so that Hoffman can use Carolyn's compact to see that Barnabas doesn't cast a reflection:
But in this ep, the mirror is right back where it belongs:
Perhaps while events were taking place in Ep #1035, an unseen servant in an unseen moment took the mirror down for a special cleaning? Yeah. That must be it!
And then the mirror was simply put back before the events in this ep were taking place. Foolish me for calling anything into question...