This was the first Disney cartoon to be fully conceived on storyboards. Previously, simple sketches were drawn on a page giving a broad overview of each scene, with descriptions of the individual actions and gags typed on a separate page. Storyboards in the modern sense (drawings pinned on a bulletin board detailing every action on a film) were invented at the Disney Studio in the early 1930s.
The original version featured the Wolf dressed as a Jewish peddler (complete with oversized false nose) to gain entry to the pigs' house. A second theatrical release, not long afterward, used new animation and dialogue in this scene. This second theatrical version is the one used in the DVD release.