Board Thread:Wiki-Related Discussion/@comment-15736398-20141111181225/@comment-6336478-20141112002640

Utter solitude wrote: Here's something else to consider:

Adam's tweet of the script cover for "Fall" has 409 as its production code. This alone kind of seals the deal. They consider "Fall" the ninth episode of the season. Putting "Smash the Mirror" Part 2 as 409 would be innaccurate.

The fact that the episode will later be split into two is irrelevant.