OH, and I LOVE Big Love. My son was watching it with me as he has done before and has a LDS friend. He compares and contrasts it to what he knows of the church(not a lot) too.
They get it pretty accurately when they are espousing the true LDS teachings. Not the polygamy stuff so much as when they are giving details of LDS history etc. I am pretty impressed with some of it. But they miss a few things that I think are give aways that they don't have any LDS person paying attention to certain details.
One thing-I have always known LDS people to fold their arms (almost protectively or defensively) in prayer. Had the Henricksons really been mainline for years as stated, then that habit would have been ingrained, and I suspect it would also be done in the 'compound', as the LDS church came out of a more fundamental style of mormonism.
And food storage. Barely touched on, but kind a big deal. And Margene seems essentially clueless about the religion and for all the male superiority mentioned here, the only grief/disapproval she gets about her clothes is not from her husband or a man, but her sister wife Nikki. Even a run of the mill LDS guy probably wouldn't put up with a wife dressing like that without at least a gentle nudge in the direction of some more modesty. I didn't find them to be overbearing, but I wasn't married to any of them!