One Piece - Volume 72

-Law's nicknames for the whole crew
-which Japanese prefecture best represents each crew member
-Barto is 24
-A pun based on a nipple joke* (when dwarves were exploring Robin) was rejected by the editor [Aohige explained when the chapter came out that this is clearly what he was going for, even if the joke was toned down in the end]
-Abdullah and Jeet are based on pro wrestlers [DUHH]
-Ideo is based on Ideon
-Sex-change rookies

*chikubi = nipple
chiku = area/zone/district/point
Oda wanted to write "Point B" as "B-chiku" (which is a sort of anagram of chikubi) but he was forced to change it to B-chiten (means the same thing, essentially).

redon: "Somewhere in La Mancha, in a place whose name I do not care to remember, there´s a spanish-speaking community with more than 30,000 members.
Konochiwa, Oda-sensei!! I write you this letter as a representative of this community becouse we´ve realize that Dressrosa is based on Spain. Apart from the obvious cultural references, we´ve identified some buildings from the Kingdom of Spain. For example, the "Parc Guell" in Barcelona (Acacia Plaza), the "Puente Nuevo" in Ronda (end of Acacia), the "Alhambra" in Granada (Doflamingo´s mansion), among others. What reasons take you to choose Spain? If you visit Spain sometime, we hope that you come to the "Salón del Manga" of Barcelona. But don't fear, here women don´t stab.
P.N. Pirateking´s voice."

Oda: Yes. I've shortened it down/abbreviated it a bit, but this was a letter from Spain. The Japanese is strange in a few places, so I think they must have used translation software. Anyway, thanks for writing. Yes, you're right about Dressrosa. It's modeled on Spain as well as the colosseum of Ancient Greece. I came up with Spain after staring at Doflamingo and thinking to myself "What country would fit this guy?" I've received a lot of SBS questions about what country was used as a model, but this one was interesting because it was pointed out by people from that actual country. I don't know if I did it all justice in my drawings, so if I've used your culture or buildings in a strange way, please forgive me.