Trivia: Horton Hears a Who!
- Actor Allusion: This is not the first time Blue Sky Studios got Will Arnett to play a sinister looking bird.
- 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).
- 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.