First of all, Tammy, amiga, you know I am okay with different opinions from my own.
As I said in the preamble earlier, I have no proof, none whatever ever, not from interviews, not from anything, just my own interpretation of the most powerful movie in my life. Only Ang Lee and the people close to him would know for sure what was intended.
Having said that, I think there can be consistent deductions that would make sense, and make the movie even more powerful and meaningful for the individual. It has nothing to do with right or wrong...it has to do with meaning. Regardless of what anyone else think, or even what Ang Lee himself say, I can still admire the convergences of so many disparate elements that gives this movie depth and soul.
I have no problem if you think that I am a little crazy to believe the horse and rider was carved by Ennis. I have no problem if you think the lighter was not a momento that Jack gave to Ennis. I believe they were, and they give deeper meaning to the movie for me.
I agree with you that there are other little bits of detail that can be interpreted in ways that are not supportable, like the rifle, like the cherry cake. I don't know about the pillow because I don't remember the short story very much. I will have to check on that...I never noticed those pillows, because tears usually obscure the detail by that scene.
I have changed my mind about the lighter. I think it was the same lighter that Jack used in the bar, that they shared on Brokeback Mountain that summer. Ennis wore the same jacket for twenty years. He is one of these people who takes care of his belongings, and as PattyJean pointed out, these lighters, properly cared for, can last forever. With Ennis' faithful devotion, I have no doubt that lighter was his most treasured possession. So only four years after that summer of '63, Ennis was most certainly flicking his wick with Jack's lighter.
Finally, I believe the two shirts are still as powerful a symbol as ever, because they are the last moment the two were together...the last embrace, the intimacy of that moment transcends all else. Most of all, it was the moment after the punch. Ennis for four years, regretted that punch thrown in anger and frustration. He pretty much said it in the motel. Thought Jack was sore from that punch. The two shirts proved to him, in that moment, in a flash, that Jack loved him even then, from the beginning. The symbolism of one shirt in the other, of Jack's shirt embracing his own shirt, was further emphasized by Heath's genius decision to change them around in the last scene. It shows unequivocally that Ennis understood Jack's meaning, putting Jack's shirt inside his own. Ennis responded..."Jack, I swear."
The little gifts were only building up to show the bond, like the shared moments by the fire, shooting the elk, chopping wood, drawing water...etc. The shared moments, momentos that strengthen their bonds, do not weaken it. More strands in the rope, make it stronger. The additional strands does not diminish the strength of the medallion hanging on the end, and that to me, would be the two shirts, the ultimate symbol of Jack's deep abiding love for Ennis, from the beginning to the end.
JMHO