How funny, I went to the thread you mentioned and I had totally forgotten about it, in the thread I even posted a mention of a truck going from left to right and later in the film right to left. (must be my creeping slow timers)
just off the cuff I noticed a few things that may qualify BM as a palindrome
1) the white shirt inside the blue shirt taken outside the Twist's closet / later Ennis exchanges the shirts and puts them back inside his closet
2) Thanksgiving dinner with the Twists and Newsome's / later the Thanksgiving dinner at Monroe and Almas charming little house
3) Ennis knocking down Jack down on their last day / later Ennis getting pounded into the ground after the Thanksgiving dinner
4) Ennis seeing the gutted Ewe after TS1 / later Ennis imagining Jack beaten to death
5) Aguirre's "marriage" ceremony of the boys in his trailer / later the Delmar marriage ceremony
6) the post office scene when Ennis first hears from Jack / later same post office when Ennis get word of Jack's death
7) Jack washing Ennis's shirts in the creek / later Alma washing Ennis's shirts in the sink

TSI / TSII
if you would like to merge this, that would be great, maybe it will spark someone's interest, meanwhile I'll start taking my vitamins so my memory gets better.