An adorable alien named Meap lands in the Flynn-Fletcher backyard, and the kids try to return him to space. Meanwhile, Doofenshmirtz plots to reunite with his long-lost best friend, Balloony.
- Abstract Scale: Phineas invents a cuteness meter to find Meap after he wanders off after Candace.
- Aliens Speaking English: Meap can only say his own name, while Mitch speaks English fluently. When Mitch is defeated, it's revealed that Mitch's mustache is a Universal Translator, and the language dynamic reverses.
- An Aesop: Candace learns to not judge a book my its cover, then immediately forgets this lesson when she sees an alien monster, whom Meap identifies as his wife's mother, thereby validating Candace's decision to run away.
- Badass Adorable: The seemingly helpless Meap is an intergalactic crime fighter who "busts" criminals, and quickly takes a shine to Candace in that regard.
- Big Damn Heroes: Candace comes to rescue her brothers and Isabella after they've been sort-of-abducted by Mitch.
- Bread, Eggs, Breaded Eggs: Doofenshmirtz charges up a surplus of static electricity to steal every balloon in the Tri-State Area. We see balloons get snatched from a child, a clown, and a clown child.
- Companion Cube: Balloony to young Heinz Doofenshmirtz.
- Evil Poacher: Mitch, though Phineas briefly misidentifies him as a zookeeper.
- Hilariously Abusive Childhood: Some new staples of Doof's backstory are revealed here: at one point in his childhood, the Doofenshmirtz family disowned him and he was taken in by ocelots. To make ends meet, he got a job at a carnival and spray-painted a balloon, which he named Balloony. That balloon became Heinz's only friend until the balloon floated away while Heinz had to work as the Doofenshmirtz family lawn gnome.
- In a World...: Don LaFontaine closes the episode with this line. This was his final role before he died in 2008.
- In Memoriam: For Don LaFontaine.
- Insistent Terminology: Mitch insists that he's a poacher, not a zookeeper. Technically both apply (he's illegally acquiring animals for his zoo), but "zookeeper" makes him sound legitimate.
- Let Us Never Speak of This Again: Baljeet and Buford get one scene and a line each in this episode, as Ferb takes Meap's modified ship for a test drive around town. As he flies by Baljeet and Buford, most of their clothes are sent flinging off their bodies, and the two boys agree to this.
- Luke, I Am Your Father: Parodied. Before the kids learn that Meap is not an innocent and helpless little creature, they assume that Mitch's mug shot is a picture of Meap's father. Apparently, this isn't the first time people have jumped to that conclusion, as Mitch definitively states to Meap that he is not his father.
- May the Farce Be with You: The show has made plenty of references to Star Wars, but this one takes it up a notch (at this point, we're still two seasons away from Phineas and Ferb: Star Wars).
- Oblivious to Love: Phineas to Isabella, as always.Isabella: (Sarcastically) I still need to get my You-Wouldn't-Know-Cute-If-It-Bit-Your-Leg-Off Accomplishment Patch.
Phineas: Cool! Let's go.
- Precocious Crush: In Ferb and Vanessa's second onscreen interaction, he flirts with her as he shows off the modified alien ship, and she actually seems impressed.
- Readings Blew Up the Scale: Phineas has tailored the cuteness tracker to ignore Isabella's cuteness after she voices concern that she may be inadvertently interfering in their search for Meap. He proves it to her by re-adjusting it to acknowledge her, and this is the result.
- Ridiculously Cute Critter: Meap.
- Sequel Hook: Over the credits, a series of unrelated clips play to promote "Meapless in Seattle", a sequel episode that was eventually made real.
- This Is for Emphasis, Bitch!: Candace gives a TV-Y7 friendly version in her Big Sister Instinct moment: "Get away from him, Mitch!"
- Uncanny Valley: How else would you describe Balloony?