I'm sorta convinced that out of boredom, many people that are involved in creating children's content will try to push up as close to the line of putting adult innuendo in their work as they can get.

See half the jokes on SpongeBob, or this gem that I saw in a Disney coloring book at the doctor's office the other day: https://me.me/i/mickey-tosses-the-salad-dinney-while-colorin...