Phineas discovers Isabella has the hiccups and decides to help cure her by building a haunted house.
Meanwhile, Candace goes to visit Jeremy but Suzy makes her visit a nightmare.
During the events above, Dr. Doofenshmirtz tries to destroy his mentor's hideout because the mentor asked him to do it.
- 555: The Johnsons' number is 555-0105.
- Arson, Murder, and Jaywalking:
- The B Grade: Phineas tells Baljeet and Buford to dress up as their greatest fear. Baljeet's fear? A failed math test.
- Bare Your Midriff: Candace after she changes outfits before visiting Jeremy.
- Droste Image: Doofenshmirtz shows Perry a series of images showing how Doof was able to predict Perry's actions and trap him; it ends with Doofenshmirtz pointing at his own chart, which shows another Doofenshmirtz pointing at another chart, which shows yet another Doofenshmirtz pointing at the chart, etc.
- Everyone Has Standards: Doofenshmirtz, who indulges in Poke the Poodle villain type plots exclusively, thinks his mentors grand plan to set fire to the sun was too much.
- Fireman's Safety Net: When Phineas falls out of the haunted house, Isabella and the Fireside Girls improvise a safety net out of their sashes to catch him.
- Halloween Episode: Even though this doesn't take place around Halloween, it first aired around that time.
- Haunted House: Phineas and Ferb made one to try and scare Isabella's hiccups away.
- Hiccup Hijinks: Isabellas problem for the episode is a bad case of hiccups.
- Noodle Incident: The fact that Buford is terrified of Suzy Johnson suggests he had a run-in that revealed her true nature, but we never learn why exactly he's scared of her.
- Not What It Looks Like: Every time Candace tries to show Linda the haunted house, it's gone and only Baljeet is there, making Linda think Candace is insulting him.
- Psycho Poodle: Suzy has trained her poodle to bite, attack, and urinate on Candace at her command.
- A Rare Sentence: "I'm calling Mom! And I am not using the banana this time!" Lampshaded by Phineas.
- Also, "Definitely the Giant Floating Baby Head."
- Reactive Continuous Scream: When Candace runs into Buford in his Suzy Johnson costume, the two end up screaming back and forth at each other.
- Scooby-Dooby Doors: Happens in one of the hallways in the haunted house as Candace gets chased by the monsters (and the Giant Floating Baby Head).