Inverted: Alice and Bob remember each Aesop forever, and even when they break them, show knowledge that they shouldn't, or explain their need to do so.
Subverted: Bob remembers not to bully others (in a series where this is not normally the case.)
Double Subverted: But it's a setup for a We Want Our Jerk Back episode, with even his former victims asking him to return to bully behavior.
Parodied: Alice and Bob's inability to retain information extends to all other forms of learning. Which is why after eight seasons they're still in fourth grade. Miss Aesop, their teacher, has taken to drink.
Zig Zagged: Alice and Bob remember some Aesops, forget some Aesops and outright reject a few.
Averted: Characters in the series learn life lessons normally, without having to have them spelled out. Character development happens in a realistic fashion and at a plausible pace.