I was reading another board (I think the HBO board, actually, which I rarely go to), and someone's opinion of the flashbacks was to draw a parallel between the fact that Bill felt a) forced to fight in the war in order to keep his family safe from the vigilantes in his town and b) the guilt and shame he felt over the promise that he would return safe and sound to his family, but didn't, even after he went to war to "do the right thing," and Sookie likely feeling some sense of trying to do the right thing, but feeling guilty herself over how Alcide died.
Contrived, maybe, but not impossible, and it made me feel a little less bored by the flashback that there's some kind of intent behind showing us all of this, obviously.
I still didn't know how Bill had come to have hep-V, except another poster somewhere said that some "blood must have gotten into Sookie's system" the night they killed the H-vamps and it splattered on her, and Bill fed from her.
As for Jess and James, I don't feel so bad for her, as they've been showing her being cold to him all season, so obviously it's not all there, for her, and she shouldn't feel so suddenly protective of their relationship when she saw him clearly moving on with Lafayette.
"There is no use trying," said Alice; "one can't believe impossible things." "I dare say you haven't had the practice," said the Queen. "When I was your age, I always did it for half an hour a day. Why, sometimes I've believed as many as six impossible things before breakfast." --Alice in Wonderland