What a splendidly complicated double cross that was! However, in the suspension of disbelief department, I doubt that anyone could have kept security on such a plot involving so many people. I still enjoyed it, though. A kick @ss episode!
In my TV market, they repeat each episode back-to-back. I watched it straight through both times. There was a spoiler which I didn't catch on the first viewing: Rollo was given the same mushrooms as Torsten but didn't die. Duh!
My take on Floki now is that he has only been playing traitor the whole time to smoke out Horik's plot. My basis is the easy opportunities he passed up to kill people close to Ragnar and the look on his face when he confronts King Horik for the last time and gets his blade in. I've got to admit, though, I was completely expecting Floki to kill Rollo (straight revenge) and Athelstan (strictly pleasure) at the very least before the episode ending rolled.
I prefer brunettes but Lagertha just seems to get hotter and hotter. The images of her all kitted out for battle leading a squad of Viking warriors and "doing" Horik's wife in single combat... I thought the TV screen was going to melt. It's a good thing my wife refuses to watch the show because of the violence. That way, she doesn't have to see me hyperventilating and repeating "d@mn" over and over.
I guess the writers had to let some of Horik's children survive for later use. I do think that Ragnar made a major, major mistake by letting Horik's eldest son live. As others have mentioned, that's going to bite him next season.
I haven't been "hooked" on a TV show in quite some time but I'm hooked on this one. I'm still holding out hope that, now that the show is established, the producers will allow the balance of "authentic" vs. "looks cool" to swing a little more toward "authentic". My understanding is that some of the main character's clothing is quite "fanciful" and inaccurate for the period.