Meanwhile, Bart and Lisa have found Grampa's old metal detector, and intend to use it to find buried treasure. Their first few attempts, however, mostly pick up nothing but buried junk.
After the incident at the farmhouse, the two find themselves once again in a romantic mood, and book an evening at a local bed and breakfast. However, they find themselves in a rut once more, worried that they may have lost the spark. But when a maid walks in on them, they find that they're actually turned on by the chance of getting caught, and begin public lovemaking sessions.
As for Bart and Lisa's treasure hunt, the two find a true treasure buried near the Aztec Theater: a film reel with an alternate ending to Casablanca, one where Rick and Jane end up together. Apparently, the Old Jewish Man worked on the movie, and tried to tack the ending onto the picture. He then bribes the kids to bury the movie again, along with another film reel with a Killing Spree Ending to It's a Wonderful Life.
Now that Homer and Marge know what gets each other going, they return to the golf course where Bart was conceived, and start getting intimate with each other. However, while they're in the act, the Flanders' end up golfing at that same hole, and sure enough, their ball gets stuck. This alerts the other golfers that something's inside the hole, to which Moe decides to smoke them out with Carbon Monoxide.
In a panic, Homer and Marge knock over their hiding place, just narrowly avoiding detection. However, they left their clothes at the golf course, leaving the two being chased around Springfield completely naked. As they try and get home without being seen, they end up cornered in a used car lot, the only exit being the hot air balloon decoration. This doesn't do any better for them; Homer's attempt to grab clothes leads to him falling out and dangling from a rope, not to mention slamming rear-first into the glass ceiling of a church. At Homer's insistence, Marge sets the balloon down... into the middle of a football field. In the middle of a game. On camera day.
Naturally, the two end up in the front page of the newspaper, and they're left trying to explain the details to the kids. While they explain, however, the two get excited, and go right back to the golf course.
- Bart: They're gonna feel so silly when they realize they forgot us...
- Adolf Hitlarious: The alternative ending to Casablanca shows Hitler suddenly appearing from his hiding place in Sam's piano, about to kill Rick with a grenade, when Ilsa drops out of the plane with a parachute and lands on the piano, trapping Hitler inside when the grenade goes off.
- Aluminum Christmas Trees: A restaurant based on an airplane sounds like something you'd only find in Springfield, but "Up, Up, and Buffet!" was actually inspired by the restaurant "Dive!", which was based on an submarine and co-owned by Steven Spielberg and Jeffrey Katzenberg in the mid-1990s.
- Awful Wedded Life: Homer and Marge have their anniversary spoiled by their kids taking them to a cheap restaurant. Their sex life is just about dead, and their weekends are rather boring.Marge: When we got married, is this how you thought we'd be spending our Saturdays? Driving out to the boondocks to trade in a refrigerator motor?Homer: Eh, I never thought I'd live this long.
Sideshow Mel: Look at that blimp! He's hanging from a balloon!
- When Sideshow Mel sees Homer at the football game.
- After the couple is accidentally barged in on by the maid at the bed and breakfast while they were trying to get intimate, she promptly apologizes and declares that she saw everything.
- Balloonacy: The naked hot air balloon sequence.
- Beachcombing: Bart and Lisa's plot, though not at the beach. They don't find much other than junk, until they find a buried alternate ending to Casablanca near the Aztec Theater.
- Black Comedy Animal Cruelty: The police dog that was used to get Homer's scent to locate him and Marge goes crazy and runs off after sniffing his underwear. A newspaper headline seen later in the episode claims that it's now "clinging to life".
- Borrowed Catchphrase: Moe of all people swipes Helen Lovejoy's line "Won't somebody PLEASE think of the children!?" upon finding Homer and Marge's clothes.
- British Stuffiness: The maid who gets startled at Homer's shirtlessness has a decidedly British accent.
- Call-Back: Homer and Marge are finally caught making love by their fellow Springfieldians at the mini-golf course where Marge got impregnated with Bart.
- Caught in the Rain: Homer and Marge's trip to repair their refrigerator winds up with them in this situation. They seek shelter in a nearby barn, then almost get attacked by the owner of the barn. One thing leads to another, and...
- Censor Box: Homer and Marge both get two in the "Springfield Shopper" newspaper article, for their privates and their chests.
- Comically Missing the Point: Bart believing his parents would be disappointed once they realized they forgot them after Homer and Marge get so aroused that they drive off to the mini-golf course.
- Couch Gag: The Simpsons are frogs (with Maggie as a tadpole) jumping onto a lily pad. Homer uses his tongue to turn on the TV.
- Dead Sparks: Homer and Marge's relationship for most of the episode. There's even a 11-year-old wedding cake still in the freezer.Homer: You know... it is a special occasion.Marge: Yeah... we probably should... you know... Rock the Casbah.Homer: Yeah, that seems like the thing to do...
- The End... Or Is It?: The Casablanca alternate ending ends with a "The End?". It's lampshaded by Bart who says the question mark "leaves the door open for a sequel".
- Epic Fail: We learn that when he served in the US Army during World War II, Grandpa was so terrible at clearing minefields that he was awarded the Iron Cross.
- Everybody Dies: According to the Crazy Old Jewish Man, the lost ending to It's a Wonderful Life was originally going to end with a killing spree.
- Free-Range Children: It's rather odd that Homer and Marge need to take the kids with them to dinner since, for a good deal of the episode, they can spend time at both their house and even go to the Aztec Theater with little objection. Presumably, Homer and Marge were so into their libido that they didn't care.
- Gone Horribly Wrong: Homer and Marge having sex wherever the hell they feel like sounded like a good idea up until they do it on the mini-golf course and the sex makes the machines go haywire, which makes people start to check what is going on with the machines, which ends with Marge and Homer running away while still nude.
- Hand-or-Object Underwear: When the bed and breakfast's maid walks in on Marge and a shirtless Homer, he panics and covers his chest with a pair of teacups.
- Additionally, when Homer and Marge are fleeing from the crowd in the nude, they're constantly covered by either their own limbs or the scenery.
- Hidden Depths: The Old Jewish Man worked in Hollywood during its Golden Age and was involved in the creation of Casablanca and possibly It's a Wonderful Life.
- Hotter and Sexier: For better or worse, this episode pushed the boundaries of sexual content and animated nudity for primetime TV. Because of this, the UK and Australia have given this episode higher ratings than usual (in the UK, this got a 12 rating [though it's a PG on the DVD] for moderate sexual content note and this episode became the first episode in Australia to have an M rating note . Though like in the UK, it's rated PG on the DVD]). In America, this episode was rated TV-PG for sexually suggestive dialogue (D), sexual contentnote (S), foul language (L), and violence (V).
- Insult Backfire: Upon he and Marge being discovered naked at the Super Bowl, Homer sarcastically asks the large crowd, "Why don't you take a picture? It lasts longer!" They immediately comply, seeing how it's a naked couple on the field of the Super Bowl.Homer: D'oh!
- Interrupted Intimacy: Homer and Marge's encounter at the bed and breakfast is interrupted by a maid walking in. Their encounter at the golf course is interrupted by nearly the entire town, and they were in public...
- Lame Pun Reaction: Homer and Marge's attitude to the restaurant the kids take them to for their anniversary - Up Up and Buffet! (a plane restaurant)
- Laugh Track: Parodied.Marge: Let's just say the country air did us good!Audience: (hoots)Homer: Bart, I told you not to leave that TV on!"Audience": "Uh oh!"
- Love Hotel: The Snuggler's Cove is a low-key version of this, being a place for lovers to rekindle their relationship. Appropriately, this is where Homer and Marge discover their shared kink of public sex.Homer: If there's anything more exquisite than Queen Anne's Lace, I haven't found it!
- Making Love in All the Wrong Places: At the bed and breakfast, the two discover that this is their shared fetish, and they decide to have sex in the sewing room and foyer of the place, then later the mini-golf course Bart was conceived. The latter ends badly.
- Naked People Are Funny: Homer and Marge spend about half the episode running around Springfield completely naked, trying to find clothes while avoiding the authorities. Hilarity Ensues.
- Naked People Trapped Outside: Marge and Homer end up in this situation after engaging in some fresco "snuggling" to spice up their sex life.
- Nipple and Dimed: In the few brief◊ glimpses◊ of Marge's bare breasts, they are drawn without nipples, unlike Homer's.
- Non-Residential Residence: Gil, who was living in the basket of a hot air balloon that was being used to advertise the car dealership he works at.
- Not Distracted by the Sexy: During Homer and Marge's naked escape, they run into Gil, who tries to sell them a car regardless of their lack of attire.Homer: Gil! Thank god it's you! You gotta help us!Gil: Well, that's what I'm here for, I mean, you're young, successful, you're naked, and you want a car with a radio, right? You kids like music, right?
- Retirony: Chief Wiggum's police dog had only one day until retirement when it was scared off smelling Homer's underwear.
- Revised Ending: In-Universe; Bart and Lisa uncover a lost alternate ending for Casablanca which has a happy ending and a Sequel Hook; the Old Jewish Guy says he had been behind it, saying that back then, the movie business "was just dopes in suits. Not like today!" He pays them $20 to bury it again...and a lost ending to It's A Wonderful Life known as "The Killing Spree Ending".
- Roll in the Hay: Homer and Marge make love in a hay barrack on a farm.
- Scenery Censor: Homer and Marge's naughty parts get covered up by a pair of lawn ornaments after they escape the golf course. Homer asks if they can switch because he didn't trust his (two gnomes sawing a log).
- Sequel Hook: The lost ending to Casablanca.
- Sexless Marriage: Homer and Marge are trying to solve this problem.
- Sexual Euphemism: "Rock the Casbah." The song itself is played over the credits.
- Sexy Discretion Shot: Twice, natch.
- First when Homer and Marge begin their Roll in the Hay, the camera pans down to reveal an eye watching them, then outside to reveal it to be that of a cow before cutting to black.
- Then when Homer and Marge are in the windmill, they kiss, the Bart and Lisa plot concludes, and we next see the Flanders' interruption of the act.
- Sexy Silhouette: Homer and Marge making love in the foyer of the Snuggler's Cove uses this.
- Slipknot Ponytail: Marge's hair coming down in the rain is clearly meant to evoke this.
- Tempting Fate: After naked Homer and Marge land in the football stadium, shocking everybody, Homer sarcastically asks "Why don't you take a picture? It'll last longer!" Unfortunately, everybody does, since it happened to be Camera Day.Homer: D'oh!
- The Talk: Homer and Marge try and explain how they ended up nude in the stadium, but ultimately Subverted as they get aroused as they describe it and go back to the mini-golf course.
- They Have the Scent!: Subverted; the dog Chief Wiggum sends after them runs away whimpering upon smelling Homer's underwear.Wiggum: That's a shame, he had one day left 'til retirement...
- Toplessness from the Back: Marge gets quite a few of these shots in the final act.
- Visual Innuendo: The naked Homer and Marge at one point hide behind a pair of lawn ornaments. Homer's is a pair of men sawing a wooden log. He asks to trade with Marge.