Similarities with Little Mermaid etc...
I was 10 when this came out, and i remember at the time thinking it was like the little memaid (disney) - obviously she's not a mermaid(!) but the way it is animated, little mannerisms, and looks that Crysta has (her sad looks)
Watched it recently, 18 years on - and I still notice them! :)
Theres a big lizard at the start of the movie that sings and almost eats the human (zak) - it's face looks exactly like flotsum/jetsum in TLM
Crysta's fascinaction with humans is like Ariels
The Evil Hexxus is similar to Ursula, after singing the acid rain song, when coming up as a large puff of smoke with a deep voice. At the end when he becomes bigger and stronger, is like how Ursula becomes larger and stronger at the end too...
When Zac/Crysta swim in the water, Crysta has the same mannerisms as Ariel in the water.. when the camera angle spins before they kiss, it's like the spinning in the 'Kiss the girl' (TLM) sequence..
The way the fairies all flock together (they look like fireflies) to the big tree, looks like the opening of TLM where the mermaids swim in to hear the concert ..
There's also similarities with Aladdin of course, with Robin Williams and also Crysta's father is the same actor/character look of Jasmine's father.
I just think that most animated movies borrow animation styles etc from other successful animated movies - either to get a sense of familiarity or just have a success like it's predecessors
sidenote - if it's set in Australia, and Zak has an Australian driving licence, why does he sound American (and says don't have a cow!)
However, all that being said, still a good kids movie ! Brings back loads of memories for me! :)