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.
The officer in the first film tells Don Juan's friends that Smiley must be kept on a leash. After Don Juan and his comrades board the ship, Smiley goes back to pee on the officer's leg. One cannot help but feel more sympathy for the officer than Smiley since the former was just trying to do his job.
What Do You Mean, It Wasn't Made on Drugs?: In the first movie, you have evil shark gangs and magic moonbeams. The sequel takes this up to 11. There's a scene where the talking dog is riding in a seahorse-driven chariot and shooting a magical flintlock pistol at some evil sharks. It's either the most awesome thing every filmed, or the crackiest thing this side of Katamari Damacy.
"Your grandfather loves to tell stories, but like all sailors, you shouldn't take it too seriously."
Counterpart Comparison: Maltravers, as a power hungry, arrogant and ambitious man with a mustache, slicked back hair and an eyepatch and wants to kill an entire group of beings that he doesn't approve of, bares a very strong resemblance to Fuhrer King Bradley, just without the coolness.
Dude, Not Funny!: It's been getting this reaction because it features the the Titanic not sinking, along with everyone getting saved (yes, even the band and the Captain), which many consider an insult to those who died in the real tragedy.
Ho Yay: The two young male mice, Connors and Ronnie, are quite touchy-feely throughout the film. Makes more sense than when Connors ended up with Stella, who he only shared a few lines with.
Angst? What Angst?: Our heroes seem to care very little about the fact that they're stuck in Atlantis forever, even though on the surface Don Juan has his gypsy brothers, Elizabeth has her father, Connors has a wife, and Ronnie has a sister and family.
Fridge Horror: Where did Razor-Teeth get that captain's uniform he wears?
"Funny Aneurysm" Moment: "This liquid looks pretty! Let's drink it.". The said liquid is colored green. In these days, one of the more well-known drug detectors will turn the drink green when it discovers a date rape drug.
Sequelitis: Even though the first movie was one of the worst adaptations of the Titanic sinking, this movie was even worse than its predecessor.
Unintentionally Unsympathetic: The King of Atlantis is a good example. He's intended to be a good guy, yet he does not allow Elizabeth, Don Juan, or the others to return to the surface, makes them immortal without telling them, and forces them to live in Atlantis forever.