SpongeBob SquarePants is a popular cartoon, and has been referenced in popular culture numerous times. Several of these references are from other Nickelodeon shows and shows from another networks.
The Adventures of Jimmy Neutron: Boy Genius
In the episode Operation: Rescue Jet Fusion, Jimmy, Carl, and Sheen go into the ocean to look for a tracking device, and when they find it, a faint light can be seen at the mid-right. A commercial stated that the light was SpongeBob's pineapple.
America's Funniest Home Videos
In one episode, a guy in a SpongeBob costume was shown running around in circles and then he falls. Tom Burgeron calls him "SpongeBob ClumsyPants."
In another episode, a SpongeBob birthday cake is seen.
In another episode, there was a boy picking his nose who was wearing a SpongeBob T-shirt.
In the episode "A Smith in the Hand," after Stan announced his new station Clean TV, in one scene, several kids can be seen crying to their mother with one of them saying "Where's SpongeBob?" and another saying "I want Patrick!"
Peter has a yellow square toy. It is very similar to when SpongeBob screams in SpongeGuard on Duty. Angelo has the same toy, but it's orange.
In part one of the first season finale, Master Pakku coyly stated to one of his students, "Nice work... a couple more years and you might be ready to fight a sea sponge." The show's creators later said in the audio commentary of Siege of the North Part I that his statement was a friendly poke at SpongeBob SquarePants.
The Cleveland Show
Early in the episode "Buried Pleasure," Cleveland has holding a banana-shaped stuffed toy that looked like SpongeBob.
In another episode, Holt mentions SpongeBob.
The Creative Pet Grooming Show 2013
When a woman walks into a room, the SpongeBob theme can be heard.
The Daily Show
In the May 2, 2011 episode, Jon Stewart jokes that Osama bin Laden now "lives in a pineapple under the sea", showing a picture of him sitting on Conch Street.
In the April 23, 2015 episode, Jon Stewart says "Dear God, SpongeBob, what have they done to you?" upon seeing the NSA's recycling mascot.
In "The Vampires of Venice," Rory insults an alien species called the Saturnyn, and uses the word SpongeBob.
Wooldoor Sockbat is a parody of SpongeBob, spoofed also with Stimpy (from The Ren & Stimpy Show) and the Looney Tunes characters, also he has theme music similar to SpongeBob's.
In the DVD version of the episode "Captain Girl," between Toot jumping through the water and Toot inside it, the narrator says "Three weeks later," then it shows the island of SpongeBob, with the Drawn Together house between the palm trees.
In "Finns of War," a sea sponge who looks like SpongeBob is seen.
In "Wish Fixers," Timmy wishes to have running pants made of cheese, and then Cosmo calls Timmy "CheeseBoy SquarePants".
Another reference can be found in the episode, "Something's Fishy," where the king of Atlantis, Greg, states that their diets consist of "crabs, starfish, and the occasional underwater squirrel", as a joke to their fellow Nick animators.
Another reference can be found in the episode "App Trap" where the first kid with the smart phone has SpongeBob's pants, buck teeth, eyes, hair and freckles.
SpongeBob SquarePants has been referenced numerous times:
In "Prick Up Your Ears", Stewie is seen playing with a green SpongeBob toy.
In "Road to the North Pole", Stewie asks Brian if SpongeBob and Elmo were real and asked if SpongeBob really gives Squidward the business.
In "Turkey Guys", a balloon of a SpongeBob parody called "SpongeCow" is seen during a Thanksgiving parade.
Fanboy and Chum Chum
In the episode, "Cold War", Kyle gets chased by Fanboy and Chum Chum clones in a similar way to the robot chasing the man in the episode "Krab Borg". Yet, the episode has a similar plot to "Naughty Nautical Neighbors", and when Kyle enters the Fanlair, it's similar to how Squidward enters SpongeBob's house in "Pineapple Fever".
The episode "Excuse Me" has a somewhat similar plot to "Ditchin'".
In the episode "Caught in the Act", Martin refers to Nanny G as SpongeBob Hotpants.
In "Casino", Oggy is seen hiding in the mailbox and pops out to receive his mail (Jack does the same thing later), which is similar to how SpongeBob scares the mailman in the episode "Chocolate with Nuts".
In the pilot episode there is a cameo of an identical character to SpongeBob appearing at a nightclub between the characters. The character even makes it clear that is not SpongeBob, but a cheese while chatting with a female bread.
In "She Used to Be My Girl", Lisa, needing a god to pray to, tells a newscaster she is praying to Jesus, Buddha, and SpongeBob. Then the camera shows heaven, where Jesus, Buddha, and crudely drawn SpongeBob are. Buddha asks Jesus, "Perhaps we should help?" and SpongeBob interrupts, saying "Screw her!", then laughs insanely, while Jesus shakes his head.
In "The Wife Aquatic", Marge and Lisa go to an aquatic museum where there is an exhibit that reads "The Science of SpongeBob" and it shows a SpongeBob statue next to it. Patrick Star also appears as one of the mollusk photos.
In "Treehouse of Horror XX", a Frankenstein's monster was dressed in a SpongeBob costume. Later, SpongeBob told the Simpsons he was secretly very evil.
In "Angry Dad: The Movie", Bart mentions SpongeBob when he claims he likes cartoons. He says: "I've always loved cartoons, going way back to the real early SpongeBobs".
In "Yellow Subterfuge", When Krusty asks to Lisa if could sell foreign rights to your show, Lisa says that even SpongeBob did it. She shows him an Italian parodied version of SpongeBob SquarePants on her tablet called Spugna Roberto Quadrati Pantaloni ("Sponge Roberto Square Pants"). In the show, Spugna Roberto (a parody of SpongeBob SquarePants) gives a gift to Squiduardo Calamari (a parody of Squidward Tentacles) for his birthday and says that the gift is a mine from World War II. Then, a seahorse presses the button which makes that the mine explodes and kills Spugna Roberto & Squiduardo in pieces. Then, a fish appears and says: "Calamari?", screams: "No...!" and starts crying. In the parody, Roberto lived in a watermelon under the sea. Actually, SpongeBob lives in a pineapple also under the sea in the original TV animated series from the real world.
An episode of The X Presidents (from "TV Funhouse" on Saturday Night Live) depicts SpongeBob refusing to star in a pro-Gulf War II propaganda commercial, and getting held prisoner for it. Tom Kenny provides SpongeBob's voice, which is surprising as this clip has relatively adult content.