While the kids are off looking for Chunky, the parents discover a secret cave beneath the treehouse.
Tropes for this episode include:
- Green-Eyed Monster: When the cave proves that there was someone smarter than him (like a reclining massage chair), Phil sets out to destroy the cave and all of the evidence there in.
- It's Been Done: The underground cave has all of the same innovations that Phil made for the treehouse (like plumbing, an elevator, and a massage chair), only better (a reclining massage chair and hot water).
- Simultaneous Arcs: The episode is set during the events of "Fam Farm Fun Fest", following what the parents were doing at the time.
- You Are Better Than You Think You Are: When Phil begins to doubt his status as an inventor, Hope sings a song about all of the innovations he has made for his family.
