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While The Cat in the Hat was able to have an interactive read-along based off his own story by Living Books, he would also show up as an Easter egg in the other 2 interactive read-alongs of Dr. Seuss books. In Dr. Seuss's ABC, he will appear if you click on one of the C's on the Letter C page. In Green Eggs and Ham, he will jump out of the box featured on page 17 when clicking on it.
Dr. Seuss's ABC Easter egg:
https://www.youtube.com/watch?v=mP9hPEIPpTY#t=2m28s
Green Eggs and Ham Easter egg:
https://www.youtube.com/watch?v=Djdi1RaAYbY#t=47m50s
The Cat in the Hat read-along story:
https://www.youtube.com/watch?v=rMTiYBD3uKQ
List of all Living Books games, showing that the other 2 came first:
https://www.mobygames.com/company/2353/living-books/games/
https://www.youtube.com/watch?v=mP9hPEIPpTY#t=2m28s
Green Eggs and Ham Easter egg:
https://www.youtube.com/watch?v=Djdi1RaAYbY#t=47m50s
The Cat in the Hat read-along story:
https://www.youtube.com/watch?v=rMTiYBD3uKQ
List of all Living Books games, showing that the other 2 came first:
https://www.mobygames.com/company/2353/living-books/games/
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In the game's Alphabet Sing-along, there's an Easter egg that'll occur by clicking the letters S-E-C-R-E-T in that order, right after Izzy and Ichabod sing the alphabet song. Doing so will make a man in a purple sweater appear and sing "A B C D E F G- whoops, Sorry.".
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Picture source:
https://livingbooks.fandom.com/wiki/Dr._Seuss%27_ABC#Trivia
What the Options Menu looks like in the final game:
https://www.youtube.com/watch?v=_Igeroz4m94#t=1h29m20s
https://livingbooks.fandom.com/wiki/Dr._Seuss%27_ABC#Trivia
What the Options Menu looks like in the final game:
https://www.youtube.com/watch?v=_Igeroz4m94#t=1h29m20s
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