Oh, sure, I can pick just one....well, no.
All that you all have described, plus...
From Ennis, who was wordless all too often -
In the motel scene, Ennis has been stroking Jack's forearm while they're talking and smoking, and when Jack says "Brokeback got us good" Ennis reaches his hand over a little further, holds on, and pulls Jack's arm tight around him.