I've looked and looked, but I can't seem to find the Conan O'Brien interview anywhere. Just a whole lot of gifs of his reaction. And the one that's been gepostet on this spot isn't available anymore. Sorry :(
Hopefully someone else might have better luck than I did.
I think I have found it! I'm going to post it on this site under the name '(中字)when Tom Felton saw the Foto about Draco and Harry! haha funny!' so Du can watch it too! It has Chinese oder Japanese subtitles but it's all in English. :D