Reference Quote or Context Episode(s)
Chocolate with Nuts At the beginning of the episode, when Phineas pops out of the mailbox and scares the mailwoman, it could be a possible reference to SpongeBob whenever he camps in the mailbox waiting for the mail. "No More Bunny Business"
Tea at the Treedome During the song Atlantis, Ferb is shown drinking tea from his helmet, like SpongeBob and Patrick do in the episode "Tea at the Treedome". "Atlantis"
Krab Borg Doofenshmirtz running from the robot from the movie earlier in the episode "Krab Borg". The man being chased?  Dan Povenmire, co-creator/executive producer and Doof's voice actor. "Phineas and Ferb-Busters!"
SpongeBob and Patrick Phineas digs up a yellow sponge and a pink starfish and then tosses them into the ocean saying "Oh, look, a sponge and a starfish! There's gotta be something we can make outta this! Aw, oh no, that's ridiculous!!". These could be references to SpongeBob and Patrick. "Phineas and Ferb Summer Belongs to You! "
Someone's In The Kitchen With Sandy Phineas eats his ice cream the way Sandy eats her Krabby Patty in "Someone's In The Kitchen With Sandy".

"Moon Farm"

Have You Seen This Snail?

Phineas, Ferb and their friends put up posters and sing a song in hopes that Perry will hear them and come back home. The premise of the search and the song "Perry Come Home" are both quite similar to SpongeBob's efforts to find his pet snail, including the song in the background "Gary Come Home."

"Oh, There You Are, Perry"

Krabby Patty Creature Feature-When everybody in town except Doof turns into Doof zombies,that could be a reference to when everybody in Bikini Bottom except SpongeBob turns intoo Krabby Patty Zombies.-Night of the Living Pharmacists
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