Board Thread:Wiki-Related Discussion/@comment-15736398-20141111181225/@comment-15736398-20141118191139

Actually, they're not confused. It was AIRED as a 2-hour special, and they didn't edit the synopsis for the first part of it, which isn't actually that uncommon.

The fact that they not only list the episode in two parts on that page, but also recapped it in two parts and have two completely separate streaming links for each part (which, BTW, have their own distinct and individual "Previously On", "title card", and credits sequences) is unequivocal proof that, despite Production #s, "Smash the Mirror" is a 2-part story consisting of 2 distinct episodes that officially comprise Episodes 4x08 and 4x09 of this season (something that should be accurately reflected on this Wiki).