Phineas, Ferb, Candace and Phineas' and Ferb's friends are visiting the trio's grandparents, Betty Jo and Clyde Flynn.
Meanwhile, Dr. Doofenshmirtz has a date which is interrupted by Perry the Platypus.
Tropes found in this episode include:
- Always Identical Twins: Betty Jo and her twin sister Lorraine. Lorraine lives in a closet and only comes out once a year when Betty Jo and Clyde want to prank someone.
- Artistic License – Music: Grandpa Clyde is seen playing the banjo during the song, however, the instrument that plays is actually a mandolin.
- Aside Glance: When Doof's date arrives, he asks Perry if he can pretend to be his pet and act like "a mindless animal". Perry (who does this all the time in front of the Flynn-Fletchers) gives an unamused glance to the audience.
- Bait-and-Switch Comment: Doofenshmirtz, as usual, describes Perry's presence as an "unexpected surprise". By "unexpected", he actually means "unexpected" this time.
- Bigfoot, Sasquatch, and Yeti: The Bigfoot is described as a man-eating monster that wanders the woods.
- Bring My Brown Pants: When Buford announces his plan to take a nerd’s underwear, Baljeet offers his, which are “incredibly messy all of a sudden.”
- By "No", I Mean "Yes": Averted. This is the first time where, by unexpected, Doofenshmirtz does mean unexpected.
- Covered in Kisses: At the end of the episode, Phineas sees that Perry is back. Picking him, he notices Perry's body is covered in red lipstick marks, which were clearly from Doof's date.
- Cuteness Proximity: Doofenshmirtz's date is distracted by Perry's cuteness, to the point where she almost completely ignores Doofenshmirtz. By the end of the episode, Perry returns to the Flynn-Fletchers, his body covered with several lipstick marks.
- Early-Installment Weirdness: This is the only episode in which the Flynn-Fletchers drive a van. All other episodes has them driving Mom's station wagon.
- No Name Given: Doof's date is never referred to by name.
- No, You: Candace reaches a breaking point after Phineas' Bigfoot prank. Phineas says it was just a joke, but Candace says, "No, you're a joke, Phineas!"
- Noodle Incident:Doofenshmirtz: It's not the worst date I've ever had. There was that one that kept stabbing me with a fork.
- Ooh, Me Accent's Slipping: Carolina Rhea's Canadian accent comes through when Betty Jo says, "Soorry, Candace."
- Poor Communication Kills: Grandpa says to Ferb "Still a man of few words, I see"; Ferb tries to say otherwise, but Grandpa interrupts him before he can finish.
- Record Needle Scratch: One of these occurs during the "by unexpected, I mean unexpected" gag.
- Scary Flashlight Face: Baljeet tries this while telling his scary story, but it fails to scare the other kids. Phineas also does it when he tells his story (to better effect).
- Special Guest: Sandra Oh of Grey's Anatomy fame voices Doof's unnamed girlfriend who takes a liking to Perry.
- That Reminds Me of a Song: Grandpa, before performing "He's Bigfoot":Grandpa: If my memory serves, I think there was a song about it.
Isabella: Really? Do you remember any of it?
Cut to Grandpa strumming a banjonote
Phineas: He remembers. - Underwear Flag: Discussed. Buford says his plans for camp are to "find a nerd, take his underpants, and run them up the flagpole". Phineas tells him the camp probably doesn't have a flagpole, so he settles for taking the underpants.
- Warning Song: "He's Bigfoot," which is about how Bigfoot eats people.
