It's good you don't understand it, that's why I don't feel too bad about watching it. Half the fun of seeing the ending early is not knowing wtf is going on, then when you actually get to the end, it makes perfect sense....
I sometimes do it with books, I read the last 2 pages before reading the begining...I don't really know why, I jsut do it...
Anyway, don't try adn understand it, just accept how pretty it was, and wait till we get the game over ehre, and let the understanding make it even more beautiful