The idea for the 1966 film Lt. Robin Crusoe, U.S.N. came to Walt as he was on an airplane. The story was loosely based on the book Robinson Crusoe by Daniel Defoe, but with many changes. For example, Friday (Crusoe’s companion) was turned into a monkey. And there is much more interaction with native tribes than in the original story.
Above it all, the story was modernized so that Robin Crusoe, played by the hilarious Dick Van Dyke, was in the United States Navy. Walt wrote the idea for the story on a piece of paper and brought it to the studio. When the movie was made, he demanded credit for the story and so in the credits, a line reads “Original Story by Retlaw Elias Yensid,” which just so happens to be his own name backwards (except for his middle name.)
You could always count on Walt to focus on the little details which added fun and wonder to everything he did.
Growing up in Los Angeles in the 70s/80s we visited Disneyland on a regular basis and often after school, before "Annual Passes".