Trivia for
Horton Hears a Who! (2008) More at IMDbPro »

• 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.
  
  
• Green eggs (from “Green Eggs and Ham”) are briefly seen during The Mayor and his 97 kids' breakfast.
  
  
• 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.
  
  
• Shipped to some theaters under the codename "88 Keys"
  
  
• After the snow falls in Whoville the children can be seen building a 'Grinch' snowman.
  
  
• The fantasy sequence in which Horton imagines himself to be a great hero to the Whos is animated and spoken in a faux-Japanese anime style.
  
  
• Some of the trees seen in the movie resemble Trufula Trees from another Seuss story, "The Lorax."
  
  
• 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".
  
  
• A Who holding a plate of ‘Green Eggs and Ham’ is visible during the crowd scene at the end of the film.
  
  
• Morton the mouse, who isn't in the original book, is actually named after the baby elephant/bird creature, Morton, from "Horton Hatches the Egg."
  
  
• 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”.
  
  
• Amy Poehlers 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.
  
  
• The basket that JoJo McDodd jumps into to reach the slingshot which ascends him to the old observatory, is actually a part of a giant Alexander Calder sculpture known as a "mobiles".
  
  
• The observatory building is shaped like the Cat's hat from the book "The Cat in the Hat".
  
  
• The mayor's skiis have the same design as the Cat's in the book "The Cat in the Hat Comes Back".
  
  
• The first portrait that the Mayor shows to Jo-Jo is, in fact, a Who-style caricature of Theodore Geisel (Dr. Seuss).
  
  
• In the scene where the Mayor of Whoville consults Dr. Leroux about what would happen if Whoville was a tiny spec in space, you can see that Dr. Leroux 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..."
  
  
• 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.
  
  
• The first Dr. Seuss adaptation fully animated using CGI technology.
  
  

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