How about Jack's pose against the pick-up in the first scene. Always makes me think he's thinkin' "Hey, boy..." Nothing more. Just that.
And when we were watching it together the other night, my husband goes in Ennis' morning-after scene, "Oh, shit. What the *hell* did I do last night?" Then, when he's looking into the tent at Jack that night before going in, he says, "Whatever it was, I wanna do it again."