I stayed up to watch the second airing (can't watch the first airing because it comes on at 7pm Mountain time and don't want my kids watching it) and even though I knew what was coming (not the who) it was crazy to watch. The best part is that my wife had no clue what was coming, so it was like my own little GoT Red Wedding moment.
Don't read below if you haven't seen the show, I also am going to compare with the moment in the comics.
I fully expected Enid's head to be on that pike....I also thought Luke would've been on there, or at least someone from that group (possibly Connie or Kelly after their interaction at the fair), but that didn't happen. The real shocking one for me was Henry, I thought they were going to go the comic route and have it be Ezekiel. I also was a bit surprised that Rosita survived (she didn't in the comic).
Also, the whole scenario went down quite differently in the comic than in the show....not necessarily a bad thing. Watching how it went down in the show, with how Siddiq described everything, we have to assume more whisperers were at the fair and abducting people. In the comic, it was Alpha walking around and talking with people (no one had seen her face in the comics at this point), and although not shown in the comic, it was easy to assume she personally killed each person and then took their heads. There's no way that she could just take each person from the fair to another location tie them up and kill them en masse. Not a major sticking point to me, but other than those other two we saw at the end of last week's episode, there's no evidence of any other whisperers at the fair. That makes me curious to see what scenes were cut from the episode.
The last two weeks have been some of the best episodes of the show IMHO. I'm glad that the show can still surprise me, that should happen more often because we are nearing the point where I stopped reading the comics.