Concerning the "last" two episodes (again)...
Spoiler for 4 parts from the novel fitting into two episodes:
Melancholy V: Ryouko's empty apartment, Itsuki and the blue giant.
Melancholy VI: HaruhiXKyon in closed space, epilogue.
Someday in the Rain was a standalone epilogue, ending the current arc and leading to the next arc (season).
