I added Jimmy's info to my Card Info file, as well as the other errata card info I mentioned. It's up on my site now.
If Jimmy does get the urge to comb though the IR cards for changes, I'll add those too, although I agree it's not likely to be as interesting.
Is Horrid Cacophony updated? It should have stated it's damage source.
Horrid Cacophony did get updated, I just missed it. "Deal each" becomes "The Matriarch deals each."
Is it true that the damage she does when a fowl card is destroyed changed also? My original card says (H)-2 psychic damage for that, but I think I heard that her new card says only (H)-1 now. True or false?
Seconded, and Thirded, and Fourthed… 
It's H-2 on her front, 1 on her back, same as before. As far as I can tell, none of the cards have actually changed mechanically, they've just been reworded to be more clear.
Holy smokes, I've had it wrong on my Matriarch oversized card this entire time. No idea why it says (H)-1 on her front side. That will need fixing.