Board Thread:Wiki-Related Discussion/@comment-15736398-20141111181225/@comment-4839682-20141112004044

Even if "Fall" was filmed as episode 409 and will be aired as 4x09, it will most likely actually be 4x10 when everything is said and done. Emphasis mine. If the crew and ABC consider it 409, we should too.

http://i.imgur.com/ST15xU7.png