These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Atlantis: The Lost Empire
Complete Monster: Rourke is a tomb-robbing mercenary who's Only in It for the Money, but what cements him is his attitude toward his current assignment. He takes the Heart of Atlantis, which is precisely what keeps the Atlanteans alive. Without it, they'll all die. A lot of other villains wouldn't be aware of this fact, and most would leave it once they learned that. Rourke? Takes it KNOWING that the civilization will die, and just plain doesn't care. Later on, in order to ensure his escape, he throws his loyal Dragon off of his ascending zeppelin. What settles his evil here is that he jokes about it, and caps it off with a "Nothing personal!" What's rather frightening is that it ISN'T personal; he hadn't had any problems with Helga beforehand, and betrayed her simply because it slightly benefited him.
Creepy Awesome: It's mentioned in the DVD commentary that after test screenings, the filmmakers asked kids what the scariest scene in the movie was. The answers were invariably either the climactic battle or the Leviathan. Kids were also asked what their favorite scene in the movie was... and the answers were invariably either the climactic battle or the Leviathan.
Genius Bonus: Pay attention to the fish in Whitmore's mansion. They're coelacanths, an ancient and mysterious "missing link"-esque creature...which were believed extinct until 1938. The movie's set in 1914. Presumably, Whitmore's just that awesome an explorer.
Theiss Titillation Theory: Kida's Atlantean clothing bares much skin. Okay, so that's an Atlantean thing. Helga, on the other hand, wears some things with straps. Often, there is only one firmly on a shoulder at at time...