Heh
I'm use to the English voice acted version, so all the voices are really different anyway!
The fact this was a very festive episode was a little weird (been a nice warm spring in the UK to boot), but oh well!
Oh the Merry Xmas being written differently by Yuki to Haruhi.... I think its a way to show the difference in there personalities. Yuki planned everything out carefully and wanted everything to be exactly right. Haruhi on the other hand acts on impulse and doesn't really pay attention to the details!