After visiting a prison rodeo, Marge volunteers to teach convicts how to be artists and befriends a prisoner Jack (guest star Michael Keaton) who has artistic potential, but is extremely manipulative. Meanwhile, Homer suffers a back injury, visits a chiropractor, and later uses a trash can to fix people's spines.
- Affably Evil: Jack's a convict with a history of violence and fierce temper. He's also very friendly when he's mellow, appreciates all that Marge does for him, and Apu even claims he was polite after Jack shot him.
- Artistic License – Geography: Marge looks out the kitchen window and sees both the prison and the school from the same view.
- Blatant Lies: Jack lies to Marge about not burning the mural. She believes him, but moments later he sets Skinner's car on fire and Marge sees it. When Marge confronts him, he admits to having burnt the mural, but denies having set the car on fire.
- Brick Joke: When Marge is baking a cake for the warden in an attempt to help Jack get parole, she agrees to let Bart have a piece, but only if he finishes his ice cream, which he struggles to do. Later, when she's making cupcakes for Skinner in order to bribe him into letting Jack paint the mural, she gives one to Jack, but only if he finishes his ice cream, which he struggles to do.
- The Cameo: Sideshow Bob is seen in the prison infirmary with his face and hair all wrapped up in bandages.
- Can't You Read the Sign?/Not Hyperbole: After Homer's accident in the rodeo, Marge asks how he's doing. He replies that he can't complain...before pointing to a sign that says "No Complaining". When the doctor points out it only applies to the prisoners, Homer begins complaining about his back and his life.
- Disproportionate Retribution: After Skinner made him both change the original mural and blamed him for the failure of the new one, Jack set fire to the school.
- Does This Remind You of Anything?: Principal Skinner's scheduling of the school's lunch menu is an obvious jab at how network executives schedule TV shows.
- Downer Ending:
- For all of Marge's efforts to help reform Jack, he still goes back to prison after betraying her trust.
- It also applies to Homer's lucrative chiropractor business being sabotaged by rival doctors with him unable to do a thing about it. His plot even references the downer ending of Chinatown.
- Face Palm: Marge covers her face with her hand when she sees Jack setting Skinner's car on fire.
- Foreshadowing: After her first day working at the prison, Marge tells Bart that Sideshow Bob sends his regards and that he's looking forward to seeing Bart real soon.
- Irony:Dr. Steve: Simpson! You're not a licensed chiropractor, and you're stealing patients from me and from Dr. Steffi.
Homer: Boy, talk about irony. The AMA tries to drive you guys out of business, now you're doing the same to me. Think about the irony.
Dr. Steve: [grabbing Homer by the collar] You've been warned. Stop chiropracting.
Homer: [choking] Not unless you think about the irony.
- Karma Houdini: Marge may have meant well, but she still lied about Jack's parole status to get him a job working around children. No comeuppance for her though, apart from being made to look like a fool for believing in Jack.
- There's also the chiropractors who destroyed Homer's trash can and forced him out of business.
- Mythology Gag: Homer asks Bart what happened to his blue shirt, to which Bart replies that he's never worn one. While Bart hasn't worn one on the show, several pieces of merchandise including posters, cards, comics, and toys have featured him wearing one.
- Never My Fault: When the overly cutesy school mural is met with an overwhelmingly negative reception, Skinner pins the blame entirely on Jack, even though he was the one who forced Jack to paint it in the first place (and over the more heroic-looking mural he made first).
- Panthera Awesome: The original mural painting for the school team Puma's Pride is a warrior woman riding a puma.
- The title, while not having any material from the source, it's referring to Pokémon.
- Chief Wiggum tells Jack that his wife Sara is nothing like the women on Sex and the City.
- Sheriff asks Jack whether maffians in prison are like the Sopranos.
- After the chiropractors destroy Homer's back-fixing garbage can, Moe sadly tells him: "Forget it, Homer. It's Chiro-town."
- Shown Their Work: When Dr. Hibbert, unable to do anything about Homer's back injury, gives him a chiropractor's phone number, Homer brings up the fact that medical doctors oppose chiropractors. Dr. Hibbert admits that's their official position but he actually believes chiropractors do a good work.
- Tastes Like Diabetes: In-universe. Even Ned Flanders thinks Skinner's idea for the mural is too sweet.