My observations: I thought the conversation between Bjorn/Seer was telling of how the season will play out when the Seer told him "not one calamity, but too many to number" ... it's going to be an exciting second half!
Ragnar seemed rather indifferent when Bjorn told him he had another son Magnus from Queen Cynethryth of Wessex - that make 6 boys - right(?).
I though the 3 brothers played a nasty trick on Ivar - trying to get him laid with the slave/servant girl knowing he couldn't get it up, and how jealous he was that all his brothers had their way with her.
I liked when Ragnar told Floki he loved him, and then Floki did the same - they were both acknowledging a longtime friendship.
The part I liked best was the tender moments between Ragnar/Lagertha when Ragnar said how he regrets what happened between them, and if she'd go to Wessex with him. Then she said she also had no regrets, and that they all thought following Ragnar was the right thing to do, and after he left - she walked outside and looked to be longing for him, and/or conquest. They still love each other.
I'm not sure why he tried to hang himself - does he miss her that much or just decided everything he's done turned into failure?
Next week looks to open into some good action sequences.