Board Thread:Wiki-Related Discussion/@comment-15736398-20141111181225/@comment-15736398-20141117195117

Smash the Mirror had two directors, two "title card" sequences, and is recapped on ABC.Com in two separate recaps (Hour #1 is referred to as Part 1, and Hour 2 is referred to as Part 2).

Hour #2 (AKA Smash the Mirror Part 2) might not have its own separate production code, but it is clearly a separate episode from Hour #1 (AKA Smash the Mirror Part 1), and constitutes the 23rd episode of Season 4.