- Some animated cells featuring noisemaking instruments were reused from the 1966 television special How the Grinch Stole Christmas!.
- The Mellomen, including Thurl Ravenscroft, a singer on How the Grinch Stole Christmas!, also lent his voice to the Wickersham Brothers.
- The Grinch makes a cameo during the song "Dr. Hoovey, You Were Right".
- Both Chuck Jones and Ted Geisel are famous for their styles of eye pupils. Ted Geisel used horseshoe shaped pupils while Chuck Jones used large circular pupils with solid colors. Both of these types of pupils are used in this cartoon as well as How the Grinch Stole Christmas!, and even a combined pupil.
- The song "Be Kind to Your Small Person Friends" is sung to the tune of "Stars and Stripes Forever".
- This is the last Dr. Seuss TV special and also the last TV special produced by MGM Animation/Visual Arts. In The Cat in the Hat, the studio change to DePatie-Freleng Enterprises.
- This is also the last Dr. Seuss CBS television special to feature the 1966-1970 Cat in the Hat Productions logo.
- This is also the last Dr. Seuss CBS television special to be directed by Chuck Jones.
- This is also the last Dr. Seuss CBS television special to feature the Cat in the Hat Productions logo at the end until The Lorax.
Read more about this topic: Horton Hears A Who! (TV Special)
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