Fun quiz! I love symbolism.
Sour expression - learned affection - or I'd say residual affection, it's more of a begrudgingly affectionate look, possibily remembering what she loved about him in the first place - enjoying watching Ennis' wonderful way with their daughters and talking about his rodeo ride, but maybe still a bit angry with him. It's like Alma moved on because she had to, but she never really forgot him on a certain level, and so much she didn't understand. She still has residual feelings, or something unresolved. Otherwise, why the upset in the kitchen over Jack?
Lureen's blonde hair - Compensation - something, anything, to keep/get Jack's attention and love. Something/Someone takes his attention away from her; he don't never seem to dance with his wife no more. Maybe she can fix it, if she just tries hard enough. She got blonder and blonder as time went on. But these women had such love for their husbands; I loved Lureen's look of satisfaction and pride when Jack stood up to her father.
Which brings me to:
Swearing at your father-in-law - Masculinity, or the traditional concept of it. Jack's the stud duck in this pond now, supplanting the alpha wolf. Man of the house at the head of the table, standing and carving the turkey. Probably he'd do the barbecue too.
Transparent bread bag - Revelation - All becomes clear to Alma, she finally admits it to herself, what she'd known along since she saw Jack and Ennis kissing.
Electric knife - well . . .
Ear Stroke - learned affection, or just plain affection - I absolutely loved Ennis' way with his daughters; he may not have had a lot of money, but he sure had a lot of love for them.

I loved during his argument with Alma when she had to go to work to supplement the family income; he asked the girls if they "wanted a push or somethin'" switching to father mode, albeit a bit gruffly, and they reply "Noooo" in unison to the sound of the swings creaking.
Peaches and cereal - prop snafu? Not traditional Thanksgiving fare.
Swearing at your ex-wife - Rebellion. You don't know nothin' about it, as in she didn't understand how it was between them - a defense of his relationship with Jack, with the confirmation that Alma knew. The conflict of Ennis' love for Jack and the way things were in society.
As well as
Punching a Truck Driver - Disappointment - with the way things were, and lashing out at the first unfortunate soul who crossed his path. Nobody could understand how it was between him 'n Jack, and sometimes men express their pain and hurt through aggression.
Getting Beat Up - almost like he wanted to feel the pain, felt he deserved it. I'm not a sinner.

Poor Ennis, such conflicting emotions about what he felt for Jack, and the negative messages from his father and society. And then the next scene, the peaceful intro of music as they ford a stream on horseback, not needing to say a thing between them. Why do we do this to each other, when love is a beautiful and natural thing between all couples.
Such an emotional film.