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 as opposed to Tiger and Bull.
Ero Ero no Mi
The Ero Ero no Mi (エロエロの実,Ero Ero no Mi?) is 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.
↑SBSOne Piece Manga — Vol. 35, Oda talks about the Ero Ero no Mi.