Phineas and Ferb create a romantic cruise to help Baljeet impress his childhood friend, Mishti. Meanwhile, Perry tries to stop Doofenshmirtz from moving the Danville lighthouse to the other side of town so he isn't disturbed by the boats.

Tropes:

• Bait-and-Switch:
  • Candace calls her mother twice, who is shown supposedly getting her hair dried in a salon. But when she hangs up, it turns out Linda was only in the living room and the sound of the hair dryer was coming from Lawrence blowing into the tube connected to it.
  • Isabella is delighted when Phineas invites her on the romantic cruise, takes her hand to the dining room, then presents her the romantic candlelit dinner for two, and then asks Ferb to show "the happy couple" to their table... Baljeet and Mishti. Cue Isabella's Death Glare because from Isabella's perspective, Phineas had finally asked her out (to a romantic cruise no less) but, in actuality, he meant as a member of his staff, not on a date.
  • When the ship starts sinking and everyone has to get to dry land quickly, Isabella asks where the life preservers are. Phineas tells her that the ship does not have any life preservers... it has fun preservers.
• Bait-and-Switch Comment:
  Isabella: Phineas, where are the life preservers?!
  Phineas: We don't have any.
  Isabella: WHAT?!?
  Phineas: We've got Fun Preservers!!!
• Borrowed Catchphrase: When Isabella appears at the boys' ship, Phineas greets her with her catchphrase, "What'cha dooooin'?"
• Bread, Eggs, Milk, Squick: Phineas holds a checklist for the romantic cruise, which includes an orchestra, dropping rose petals on the couple, a romantic love song, and sinking the ship.
• Bring My Brown Pants: Buford describes seeing the fun preserver in action as “the end of this diaper”.
• The Cameo: Vanessa makes a brief appearance in a flashback.
• Cruise Episode: Phineas and Ferb hold a romantic cruise so that Baljeet can impress his friend Mishti.
• Dissimile: Candace tells Stacy that she wishes that her relationship with Jeremy was "...more romantic. Like Romeo and Juliet romantic, but without all the dying".
• Goo Goo Getup: Phineas sets a romantic date up for Baljeet and Mishti, part of which has Buford dress up as Cupid.
  Buford: Hey, everyone, I'm wearing a diaper!
• House-Hunting Montage: Doofenshmirtz's villain backstory includes one of these, detailing how he found the DEI building.
• Luminescent Blush: Seen on Isabella as Phineas invites her to come inside on the ship.
• Meaningless Villain Victory: Doofenshmirtz technically defeated Perry when he launched the lighthouse, but because he didn't put a guidance system on the rocket, it flew around willy-nilly and eventually crashed into his building (causing all the ships to surround it).
  Doofenshmirtz: Curse you, Perry the Platypus!!!
• Model Planning: Doofenshmirtz spent an entire weekend building a scale model of Danville hoping that Perry the Platypus would appreciate his hard work (despite Vanessa telling him that he wouldn't). When Perry escapes his trap, he punches Doofenshmirtz in the face, causing him to fall on and crush the scale model. Doofenshmirtz is furious, and since he was able to successfully launch the lighthouse rocket anyways, he tells Perry to leave.
• Never My Fault: When the lighthouse crashes into Doofenshmirtz's building, he still says "Curse you, Perry the Platypus" despite the fact that it was Doofenshmirtz that launched the lighthouse and forgot to put a guidance system on the rocket.
• Non-Answer: Phineas and Ferb complete building their ocean liner, and Phineas describes her as "yar". And Ferb concurs:
  Ferb: She's shipshape and Bristol fashion.
  Phineas: What does that mean?
  Ferb: What does "yar" mean?
  • Just for the record "yar" means agile and nimble, and "shipshape and Bristol fashion" means tied down and secure.
• Noodle Incident: When Linda hears Candace being attacked by geese over the phone, she reminds her not to wear a tube top while feeding the geese like she did last time.
• Parody Assistance: Jack Jones, the singer of the theme song for The Love Boat, sings a similar song "Boat of Romance" as a parody.
• Poor Communication Kills: When Isabella is invited aboard the ship, she didn't know it was for Baljeet and Mishti and thought it was for herself and Phineas, as an attempt to get close to him; in reality, he was inviting her to be part of the ship's crew. The moment she finds out who the cruise is really for, she isn't happy about it.
• Public Domain Soundtrack: The music that the orchestra plays during Baljeet and Mishti's date (and also at the end during Candace and Jeremy's date) is the overture from the Mozart comic opera The Marriage of Figaro.
• Record Needle Scratch: Heard when Isabella realizes the cruise isn't for her and Phineas, but Baljeet and Mishti.
• Rhetorical Question Blunder: When Phineas brags to Isabella, who's annoyed that the romantic dinner is for Baljeet and Mishti, and not her and Phineas.
  Phineas: Do I know romance or what?
  Isabella: What.
  Phineas: I said, do I know romance or...
  Isabella: I heard you.
• Saw It in a Movie Once: Phineas admits that they got the idea for the romantic cruise after seeing it in "this romantic movie...".
• Sinking Ship Scenario: The cruise ends abruptly when the lighthouse crashes into the ship, causing her to sink. Fortunately, Phineas and Ferb were planning to sink the ship anyways and have a solution: the Fun Preservers.
• Shout-Out: While Phineas never mentions the romantic movie he and Ferb watched by name, the scenarios they recreate based on it are obviously from Titanic.
• Used to Be a Tomboy: Zig-zagged somewhat. Mishti used to dress as one of the boys and liked doing things like playing soccer with Baljeet, but now that she is older, she dresses more feminine. However, at the end, she admits even though she is a girl, she hasn't changed in personality and still likes doing things with Baljeet.
• Watching the Sunset: At the end of the episode, Baljeet and Mishti do this after hauling themselves away from the sinking ship, holding hands together.
• Wham Line: Done in-universe as Isabella realizes the cruise is not for her as she believed.
  Phineas: Ferb, show the happy couple to their table.
• Whole-Plot Reference: To Titanic nonetheless — the cruise, the "I'm flying" scene, and even the ship sinking when the lighthouse crashes through the bow.