My friend Miriam Tell did a blog post about children's books
with errors a while back, and this was my addition to her roster of mistakes:
Leo Lionni's A Color of His Own contains the line "Goldfish are red." with a picture of an orange goldfish. And
of course, the point that goldfish by definition, should probably be gold when
making a book as simple as possible. Annoyed parent's design tip for children's
book illustrations: You may invent your own world. However, your invented world
should be consistent between words and illustrations.