I don't really know what to make of this episode either. Like last week's it was funny but had no real flowing plot line, it was just weird things happening with the occasional good character gag. In fact this tended to be a problem with all the 'spooky' episodes throughout the anime, they were just strangeness and randomness without much participation from the main characters themselves. It's not really much of an episode for Lana, or her sisters, or Acerola, or even the ghosts that were seemingly just plot devices that abruptly leave after Lana solves the 'puzzle' to getting out (???).
There were fun enough gags though:
* The other classmates being creeped out by Mimi-tan, and then Acerola being the only one creeped out by Samson Oak's puns. Ash is the only one desensitised to all of this.
* So Acerola has a Shuppet now. Shame it doesn't get much screentime.
* Nice to see Gourgeist again, and unfortunately back to it's role as jobber to Ash.
* They somehow made Sophocles MORE comically fat.
* I know we have Hansel and Gretel and Alice in Wonderland references, are the puppets a reference to Pinocchio or another story?
* Mallow and Tsareena being relieved their guts have reverted back to normal (they seriously need to do more comedy).
* Popplio's mortified look at the very end of the Poke Problem. Whatever Lana turned into it was not for mortal eyes.