Bart gets a hold of Dennis Leary's cellphone while working at a country club to buy his own, but when Dennis Leary himself confronts Marge about Bart tricking him into playing in crappy roles, Marge becomes a more controlling mother and Bart runs off to the ancient South American city of Machu Picchu.
* AesopAmnesia: Marge learns yet again not to be so smothering and overprotective towards her children.
* BrokenAesop: Yes, Marge keeping an eye on the boy who did transparent act of vandalism the whole episode is smothering.
* JerkassHasAPoint: Marge violating her son's privacy is treated bad, but that first thing she spotted was Bart ''driving a forklift with Milhouse on it'' -- he really needed supervision. It's not even Bart's phone -- he stole it from Denis Leary and profited from it to give the actor grievance.
* MoodWhiplash: "Night is scary. DAY IS AWESOME!"
* MyBelovedSmother: The B-plot has Marge learn not to be so smothering toward Bart.
* MythologyGag: It's not the first time Australia [[Recap/TheSimpsonsS6E16BartVsAustralia hears it from Bart]].
* NiceDayDeadlyNight: Parodied; Bart is left home alone and becomes afraid of nature at night, resulting in an Overly Long Gag of Bart afraid in the dark and happy in the day ("Night is scary." "Day is awesome!")
* SomethingWeForgot: The family goes to and from Macchu Picchu looking for Bart, and once they are back on Springfield Lisa asks if they feel like they missed something. GilliganCut to Maggie, who was left behind in Machu Picchu, being worshipped by an indigenous cult.
** Bart starts using Dennis Leary's phone to cause a ruckus while pretending to be Dennis Leary, drives a forklift ''with Milhouse on it'', tricks Leary to play bad roles, and finally leads his family on a search for him and enjoys his time alone at home without being concerned over how worried his family are over him.
** Marge activates the GPS in Bart's phone and uses it to spy on him around the clock and feels absolutely no shame for violating her son's privacy whatsoever.
** Lisa learns her family was chasing a bird called a [[SeldomSeenSpecies Scarlet Tanager]] and its migration pattern leads to Machu Picchu, which Lisa had expressed interest in visiting earlier in the episode. She "conveniently" neglects to tell her family this so she can go on the trip she wants.
** Although it's a quick gag before the end and NegativeContinuity (or them racing back) will fix it, the Simpsons still left Maggie (''a baby'') in Peru, and don't really start to catch up on that until they are back in the United States.