On the American version of the boxart, Franky is absent from both the back and front (while being present on both for the Japanese release), possibly as neither the One Piece anime or manga had gotten to the Water Seven/CP9 arc in North America, so they didn't wish to spoil him joining.
The only One Piece game dubbed by FUNimation. All later One Piece games would use the Japanese dub for all versions.
Pandaman can be found throughout the game hiding in different, inaccessible areas within each zone.
The Japanese release of the game came with a Going Merry Wii Remote Holder.
In the Japanese version of Franky's joining flashback, his naked butt is clearly seen. However, in the American version, a plank was edited in, sticking up from some of the spare parts around him to censor it.