I'm sure there'll be summaries and such posted soon, so let me just elaborate on the changes of the epsiode compared to the animation.
The changes...I wonder about that if it's for better or for worse. One thing for sure, it will affect the ending in Matsuribayashi-hen. Also, keeping in Broccoli is good, but I doubt people who only watched the anime would get that
Spoiler for changes between original game & ep13:
Keiichi death scene: Stand power "The World" is cut. There's no doubt that Keiichi is the hero of Minagoroshi-hen, so cutting out the whole talk is kinda harsh. I understand having Hanyuu stopping time seems kinda absurd, but it's an important element. Instead, it's replaced with some generic talk which resulted in everyone running away (instead of everyone being excuted at the same time)
Mion death scene: They made her cool in the epsiode, which I'm not against since I'm a Mion-fan. However, cutting out one of her lines that establish her as "Mion who can't read the atmosphere" isn't what I can totally agree with. In the original, Mion was the only one that "kinda" begged to live with her line of "Hold on...wait <shot>", which of course leads to...
Shion death scene: Shion had a good line in the game, which was of course cut out. Shion actually wanted to be excuted first, to delay Satoko's death as much as possible. Even in the end, she has protected Satoko.
One of the biggest shock of course came from the end, when they announced that Saitama TV would also join in and cancel Higurashi Kai. I hope this doesn't affect other stations...
Next episode...More 34-tan