Well, I'll be damned if I didn't notice something that never registered before on my ninth viewing last night.
When Jack and Lureen are at the table with Randall and LaShawn, shortly after Randall gives Jack that long "come hither" look and just as Lureen's starting to say, "Husbands... don't never seem to wanna dance with their wives. Why do you think that is, Jack?", he's spilling something on himself - his drink, I think, a la the beans/can opener incident early on when Ennis is shirtless and about to bathe. It's the same hand movement - shaking the hand off - and disgust with himself as before. I guess this is because he's unnerved at realizing that Randall is coming on to him. And of course, there's the "So... you wanna dance?" and looking dead-on at Randall first, then glancing at LaShawn right afterwards. That I'd seen before, but not the spillage. Amazing. Not a single moment of this masterpiece is unintentional. Not a one.