Milo and Zack try to help Melissa overcome her secret fear of roller coasters.
Milo, Zack, and Melissa go to Lard World, where the boys anticipate going on a roller coaster until they discover that Melissa has a crippling fear of them. After confessing their own fears, Zack's of fish and Milo's of Chinese fingertraps, the pair vow to help her overcome hers. Meanwhile, Balthazar Cavendish and Vinnie Dakota are on their latest pistachio protecting mission, safeguarding a pistachio stand within Lard World itself by building a protective frame around the stand. Balthazar ends up doing all the work, and taking all the heat as various threats to the stand emerge.
Milo and Melissa end up on the ride Greased Thunder, which becomes even more terrifying due to the effects of Murphy's Law. Balthazar and Dakota succeed in protecting the stand from one threat, only for it to be taken out by a different threat after they've taken down the protective frame. Milo and Melissa survive the ride, and then depart with Zack. Meanwhile, the Lard World mascot Lardee Boy's, is jettisoned into space, and hit by the Aliens that were first seen in Going the Extra Milo.
The Phineas and Ferb extra known as Pinhead Pierre actress is in two of the scenes as the lard ladle counter weight roles by. She's wearing green and blue instead of red and pink.
More extras appear including the female voiced man.
There are also repainted characters from Phineas and Ferb.
In Southeast Asia, The "Lard" World Is covered due to Islamic Viewers.
Phineas and Ferb - The rollercoaster that destroyed Melissa's science project on the first day of summer was the same one from the premier segment and first episode of Phineas and Ferb "Rollercoaster".
AC/DC - when the three main characters start singing "thunder... thunder... thunder" it's an allusion to the rock band AC/DC which is famous also for the song "thunderstruck".
Apocalypse Now - Both when Zack leaves his pontoon after being scared by a fish and when Milo leaves his raft after being scared of a Chinese finger trap, a voice-over of each character says "Never get out of the boat (or "donut"). Absolutely right."
2001: A Space Odyssey - While Lardee Boy's head is in space, a musical cue plays that is very similar to the iconic theme from the film.
Kirby Buckets - If you think about it, it's rather ironic that Zack is afraid fish, because his voice actor, Mekai Curtis, plays a character on Kirby Buckets who's named Fish.
The Loud House - The man in charge of the rollercoaster had LL on his hat are based of the initials of the Loud kids and the father.
When Cavendish and Dakota are talking to the pistachio vendor, in the background a woman's sweater changes color from scene to scene.
The same extra was in the audience in the Phineas and Ferb episode Backyard Aquarium wherein the same thing happens.