The Green Databook revealed that Sanji's original name was going to be 'Naruto'. However, as the ninja manga "Naruto" was about to be serialized with Jump, Oda changed the name to prevent confusion.
The two new admirals were originally going to be Pig and Kappa (which, alongside Kizaru's Monkey, would be a nod to Journey to the West) as opposed to Tiger and Bull.
Devil Fruits
Ero Ero no Mi (エロエロの実,Ero Ero no Mi?): A Devil Fruit of an unknown type. It was mentioned in Oda's SBS question corner. "Ero" is short for "Erotic". The fruit has never been implemented into the series itself, as Oda only thought this up as an idea about 13 times.[1]
Kona Kona no Mi (コナコナの実,Kona Kona no Mi?): A Devil Fruit. Charlotte Katakuri was originally meant to have eaten it.[2]
Kaju Kaju no Mi (カジュカジュの実,Kaju Kaju no Mi?, lit. Fruit Fruit Fruit): A Devil Fruit Oda initially intended for Charlotte Smoothie before deciding on the Shibo Shibo no Mi.[3]
References
↑SBSOne Piece Manga — Vol. 35, Oda talks about the Ero Ero no Mi.