Horton Hears a Who!/Trivia
- Development Hell: Blue Sky Studios reported to have the rights to Horton Hatches The Egg, but that was years ago, and so far nothing has come of it.
- Hey, It's That Voice!: In the 1970 special, both Horton and the narrator are Captain Hook, and the Kangaroo is Granny (among many, many others).
- Shout-Out: Several in The Movie to various Dr. Seuss works.
- One Who has a blue hat similar to the one worn by The Cat in the Hat, as well as a few of The Cat's mannerisms (including a smaller version of himself underneath his hat).
- The Mayor and his family eat Green Eggs and Ham for breakfast.
- The city council seems to consist of Grinches.
- Rudy's imaginary clover friend is named "Thiddwick", a refrence to Thiddwick the Moose
- The Mayor has a red fish as a pet, possibly a refrence to One Fish Two Fish Red Fish Blue Fish.
- One of the portraits of past mayors was Dr Seuss himself (specifically, the one of Ned's father)!
- The Other Darrin: The 1970 special is very inconsistent in voicing background characters. This is most notable in the "Mrs. Toucanella" number, where the birds seem to have different voices every line.
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