Happosai's has the same sound as a popular Chinese seafood dish in Japan also known as "eight treasures dish".
In the Japanese version, Principal Kuno's speech is littered with Hawaian pidgin to try and convey his otaku-like fixation on Hawaii. In the English dub, this is replaced with gratuitous Hawaiian, to convey the exact same point.
It was never revealed why Ukyo never told Ranma she was a female in the first place despite dressing up as a male and having a male name as a kid.
The reason Kirby Morrow took over as the English voice of Dr. Tofu was because Ian James Corlett had a fallout with Ocean Studios and left the English dub production after four seasons and anime voice overs overall. He has since only stuck with voice overs for domestic animation.