They could have put a toothpick in Sanji's mouth instead of a lollypop. Not many people suck on lollypops ALL DAY long, but a lot have toothpicks in their mouths a lot. Hell, sometimes I put a toothpick in my mouth for hours for no reason whatsoever.
As for Nami stabbing herself, they could have had her look at the tattoo, raise the knife to stab her arm, then just cut to Luffy's stopping her. They would just edit out the blood on Nami's arm. I'm sure some of you may think that that idea takes too much impact out of the scene, but I think it could work. I think her anger towards Arlong is represented in the fact that she is willing to stab herself, not that she stabbed herself multiple times.
For Hiruluk's suicide, leave it the way it was in the original Japanese version.
Another thing, no accents. Not even a Mihawk. Okay, maybe he would get one. He's french, right? If they had to give him an accent, they should make his voice sound low & slightly-french, like in the original version.