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Horton Hears a Who! (2008) Poster

Trivia

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The Horton quote "I meant what I said, and I said what I meant: An elephant's faithful one hundred percent," is actually from "Horton Hatches the Egg", another Dr. Seuss story featuring the enduringly faithful elephant.
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The first portrait that the Mayor (Steve Carell) shows to JoJo (Jesse McCartney) is, in fact, a Who-style caricature of Theodore Geisel (Dr. Seuss).
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After the snow falls in Whoville, the children can be seen building a "Grinch" snowman.
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A Who holding a plate of "Green Eggs and Ham" is visible during the crowd scene at the end of the film.
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The gibberish the Mayor speaks before slamming his arm into the wall, is the same gibberish Steve Carell used when he played Evan Baxter in Evan Almighty (2007).
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Jim Carrey's second movie based on a Dr. Seuss story. The first was How the Grinch Stole Christmas (2000). Both stories have Whos in them, as well as the town of Whoville.
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Dr. Seuss's widow was so unhappy with the final product, that she went to a different movie studio, Illumination Entertainment, only to make The Lorax (2012), which she loved.
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This quote, which was spoken by Katie (Joey King): "In my world, everyone's a pony, and they all eat rainbows, and poop butterflies," is often incorrectly attributed to Dr. Seuss. In fact, the line was written for this film. The quote and the character of Katie were not created by Dr. Seuss, and were created after his death.
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The Mayor receives a goldfish in a fishbowl from a Who who looks remarkably like the Cat In The Hat (he is only seen twice, briefly - once from behind, and later from a distance - and his hat has blue stripes instead of red). Later, just before the first attack by Vlad, the Mayor is resuscitating the fish. When the fish lands back in his bowl, he leans on the side of the bowl just like the goldfish in The Cat In The Hat.
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Katie, the yellow fluffy animal, is supposed to be a tiny yak. The awkward greeting she makes was just one recording that was used several times throughout the movie.
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JoJo is also the Mayor's son, in Seussical the Musical, which also combines both of Horton's stories.
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The first Dr. Seuss adaptation fully animated using CGI technology.
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Some of the trees seen in the movie resemble Trufula Trees from another Seuss story, "The Lorax".
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Morton the mouse (Seth Rogen), who isn't in the original book, is actually named after the baby elephant-bird creature, Morton, from "Horton Hatches the Egg."
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When walking in Whoville, the Mayor is saluted by a character who tips his hat, which is the hat of "The Cat in the Hat Comes Back" with kittens inside it.
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The only person to say the Mayor's name is his wife. His name is Ned.
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Shipped to some theaters under the codename "88 Keys".
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When Horton is turning his ears into different hats, one of the hats is one worn by Bartholomew Cubbins in the Dr. Seuss book "500 Hats of Bartholomew Cubbins".
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Rudy, Kangaroo's son, mentions in one scene, an imaginary friend of his named "Thidwick". Another Dr. Seuss story is "Thidwick the Big-Hearted Moose".
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When the Mayor is showing JoJo the portraits of their family, the last one is of a caveman, who is painted on a set, evidenced by the lights at the top, and creatures hanging from the ceiling by string.
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The observatory building is shaped like the Cat's hat from the book "The Cat in the Hat".
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When the Mayor introduces Burt from Accounting to Horton, Burt can be seen holding a mug with a modified Blue Sky Studios logo on it.
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The name of the Mayor's fish, is Finwick.
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A Who bearing a striking resemblance to the Cat in the Hat can be seen, except he's yellow with a blue-striped hat.
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This is Seth Rogen's first movie to be rated G by the MPAA. All the rest of his movies are rated PG or higher.
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Green eggs (from "Green Eggs and Ham") are briefly seen during The Mayor and his 97 kids' breakfast.
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Amy Poehler's character is named Sally O'Malley, which is also the name of a recurring character on Saturday Night Live (1975), played by Molly Shannon. Both Poehler and Shannon got their careers started on Saturday Night Live (1975).
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Jim Carrey's first animated film.
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Blue Sky Studios' 4th feature film.
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From the Creators of "Ice Age".
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The only computer animated film based on a Dr. Seuss book not produced by Illumination, as they would produce the future films The Lorax (2012) and the upcoming How the Grinch Stole Christmas (2018) and The Cat in the Hat (2021), not counting Green Eggs and Ham (from Columbia Pictures).
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This is the first Dr. Seuss' animated film to be rated G by the MPAA.
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Audrey Guisel, Dr. Seuss' widow, is an Executive Producer on this film.
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The Mayor's skis have the same design as the Cat's, in the book "The Cat in the Hat Comes Back".
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The basket, into which JoJo McDodd jumps, to reach the slingshot, which ascends him to the old observatory, is actually a part of a giant Alexander Calder sculpture known as a "mobile".
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In the scene, where the Mayor (Steve Carell) consults Dr. Mary Lou Larue (Isla Fisher) about what would happen if Whoville was a tiny spec in space, you can see that Dr. Larue is holding up a piece of paper. On that paper, the first paragraph is just random typing. However, the following paragraph, it reads: "Clerk Maxwellies which othe machines, ranging fromag-neticles variety. Aside tranging. Electrodynamics at rea of theorology of the for can ever..."
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The fantasy sequence, in which Horton imagines himself to be a great hero to the Whos, is animated, and spoken, in a fake Japanese animé style.
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Jim Carrey and Steve Carell also appeared in Bruce Almighty (2003).
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This is the first Blue Sky Studios film to be rated G by the MPAA. This does not include Rio, which is PG-rated.
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The Who are similarly designed to the Grinch, which Jim Carrey also played. You can also hear the quote "we like it a lot". It is also said in Dumb and Dumber (1994), where Jim Carrey also plays one of the main characters, but the difference is that in Dumb and Dumber (1994), Jim says "I like it a lot".
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This is the first Dr. Seuss' animated film.
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This is the third Blue Sky Studios film to be about an elephant after Ice Age and Ice Age The Meltdown the elephant in Ice Age and Ice Age The Meltdown is a woolly mammoth named Manfred also known as Manny while the elephant in this film is an african elephant named Horton.
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The third Blue Sky Studios film to feature no humans after Robots (2005) and Ice Age The Meltdown (2006).
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Spoilers 

The trivia items below may give away important plot points.

There is a brief scene, that appears near the end of the movie, that features the Grinch.
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After Horton finds the speck, and the Mayor is introducing everyone to Horton, he introduces "Mrs. McElligot's". This refers to "McElligot's Pool", Dr. Seuss' sixth book.
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Sour Kangaroo is the third character in a Blue Sky Studios film to be a hidden villain the other films to have a character do something like that are Robots (2005) with Ratchet and Ice Age The Meltdown (2006) with the Lone Gunslinger Vulture this means that Sour Kangaroo is the secret main antagonist.
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See also

Goofs | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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