This was the first ep we ever watched live.
Some really clever, fun elements (like the opening "Special").
The brother stuff--the relationship, the grief, the giving, the love--this is some of the most beautiful relationship stuff they've done.
Dean trying to make Christmas for Sam. Sam doing the same for Dean so many years later.
And I really love the final scene: the brothers, simply enjoying each other's company while they can. With Christmas lights, snow, and the Impala outside the window.
Poignant (I seem to be using that word a lot), heart-hurty, with a melancholic beauty.