Foxtrot: One storyline has Jason, after seeing how much money Finding Nemo made at the box office, deciding to make an animated movie of his own - a blatant knockoff of it starring leeches called "Finding Hemo".
In a trailer for the film, which was attached to the theatrical release of Finding Nemo, Rutt and Tuke tell the audience to leave the theater if they're gonna see only one movie this year and it's not the movie they're about to see. When they notice some people leaving, Tuke says "Maybe they're gonna go find that Nemo guy." Note When shown outside of Nemo, the line is changed to "Maybe they're just going to the bathroom."
In the actual movie, Nemo can be seen among the salmon that go flying when Kenai rides a mammoth through his brothers' fishing net.
Flushed Away: When Roddy gets flushed down the toilet, he encounters a fish who asks "Have you seen my dad?"
In the Yes, Dear episode, "Natural Born Delinquents", the Warner and the Hughes families are having difficulties going to the movie theater due to Dominic and Logan arguing with each other. Jimmy tells Greg that they usually get to the movies pretty late because of it, citing one such example as, "By the time we got to Finding Nemo, they'd already found him.".
Modern Family: At one point in "Planes, Trains and Cars", Mitch holds up a plush toy of Nemo and calls him "Mr. Fish". Cam then says, "Really? You don't know Nemo?"
Parks and Recreation: In "Animal Control", Ron mentions having watched a film with his stepdaughters "in which an orange fish is separated from his father".
The Big Bang Theory: At one point in "The Fortification Implementation", Bernadette tells Howard's brother Josh, who's studying oceanography, that she loved Finding Nemo.
At some points in the "Above Parr" level, some seagulls show up saying, "MINE!".
Dory is an unlockable character, unlocked by building the reef in the New Urbem Waterfront. Dory can swim underwater (which is necessary to complete underwater races), and on land, she is protected by an orb of water.
Two Dots: One of the achievement trophies for completing an Anchor Sink expedition is titled "Fish Are Friends", with a picture of a shark.
Finding Nemo and Finding Dory were given their own trailers.
In the trailer for The Little Mermaid (1989), Flounder is nicknamed "Whining Nemo". There's also a mention in the alternate lyrics for "Les Poissons".
Killing fish, killing fish, yes we show children this
Even though the heroes are all fish
Like if they made sushi of Nemo and Dory
You'd have something as messed up as this
How It Should Have Ended provides an alternate ending to the film, where Nemo, Marlin, and Dory try to find their way back to Marlin's anemone, not remembering the way back due to passing out in the East Australian current and getting trapped inside a whale. They eventually decide to meet up with the Tank Gang, who are unfortunately moments away from dying due to being stuck in their plastic bags. In The Stinger, Dory asks the Tank Gang, who have somehow escaped from their plastic bags, if they want to appear in Finding Dory. Looks like they accepted the offer.
In "Bowser Junior's Pool Party", Cody tells Junior that he can't swim in Junior's pool because he's H2O Intolerant, paraphrasing Sheldon the Seahorse. In the same episode, when Cody nearly drowns from trying to swim, Junior paraphrases Marlin by saying, "You think you can do these things, but you just can't, Cody!".
One of the seagulls is prominently featured as the antagonist in "Mine!". In the same episode, Chef Pee Pee tries to cook Nemo, who even says, "Daddy! Help me!".
In "Bowser Junior's Game Night 5", when Junior, Joseph, and Cody play "Prove It!", Joseph asks Cody to name 10 animated movies within 20 seconds. Among the movies Cody mentions are Finding Nemo and Finding Dory.
In "Chef Pee Pee's Date!", Chef Pee Pee and Lola watch a preview for Flushing Nemo at the movie theater.
The sketch "New Gill" has Ariel trying to hook up with Marlin, among other underwater characters.
The sketch "Taking Nemo" is a mashup of this film and Taken.
Muppet Babies (2018): In "Animal and the Little Accident", a clownfish and a blue tang can be seen swimming next to a statue of a merman with the Swedish Chef's face.
Robot Chicken: In one of the holiday specials, a Mother's Day sketch has various Disney characters mourning their dead moms. Marlin forces Nemo wear a yamika while he recites a Jewish prayer, which Nemo is against because he sees the concept of animals practicing religion as ridiculous.
In "The Ziff That Came to Dinner", the film Eating Nemo is showing at the Springfield Googolplex.
The Couch Gag for "Fat Man and Little Boy" and "Home Away from Homer" has the Simpsons' couch turning out to be on the end of an anglerfish's lure.
In "The Mook, the Chef, the Wife and Her Homer", Fat Tony asks Bart and his friends if they would like to "sleep with the fishes" on a Finding Nemo bedspread.
In "Homer Scissorhands", it's revealed that Milhouse was never shown the film's opening scene (for obvious reasons). When he discovered it by himself, it took the entire fire department to get him out from under the couch.
In "Moe Goes from Rags to Riches", Bart is worried when Milhouse doesn't come crawling back to him after a falling-out, and Lisa says that "Even a kid who wears a Finding Nemo back brace has some pride."