Because the series operates on an episodic status-quo reset, it contains no serialized tragic deaths or permanent narrative closures. However, critical structural developments emerge over its multi-season run:
- The Multiverse Pivot: The production completely abandons singular continuity. The narrative continuously shifts identities: one segment treats them as common suburban house pets, the next as hard-boiled private eyes solving urban crimes, and another as occult familiars brewing potions.
- Subverting Jerry's Moral Infallibility: Later seasons intentionally dismantle Jerry’s status as an unprovoked victim. Episodes regularly establish Jerry initiating aggression, baiting Tom, and ruining domestic tasks purely out of boredom, shifting audience sympathy toward Tom.
- The Cyclical Conclusion: The Season 5 series finale ends not with reconciliation or final victory, but with an unresolved, chaotic chase looping into infinity, confirming their conflict is eternal.