Anime/Manga Differences
Here is a section explaining what changes where made from the manga to the anime.
East Blue
Romance Dawn
Morgan Arc ~ Shellstown
Buggy Arc ~ Orange Town
Kuro Arc ~ Syrup Village
Don Kreig Arc ~ Baratie
Arlong Arc ~ Cocoyashi Village
Loguetown Arc
Grand Line
Drum Island Arc
Arabasta Arc
Skypiea Arc
Water Seven Arc
Enies Lobby Arc
Water Seven Revisted Arc