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.
Americans Hate Tingle: Despite being voted as the favorite heroine in the famous Japanese magazine Animage, Nadia herself has had her fair share of detractors (DVD Verdict's Joel Pearce, in particular has called her "one of the worst heroines of all time"). Even certain critics have found the Grandis Gang annoying.
Big Lipped Alligator Moment: The Island/Africa episodes (23-34), save 30 (well, parts of it anyway) and 31. All you need to know about them is: Jean, Nadia, Marie, and King wash up on an island and meet up with Grandis, Sanson, Hanson, and Ayerton on another island. At this point, one can watch 30 and 31 and skip right to 35.
Also the sequel movie, which was not produced by Gainax, has nothing to do with the original plot, and recycles over half an hour of footage.
That's nothing. Marie (about 5 years old for the main story) is pregnant and married to Sanson!!
What Do You Mean, It's Not for Kids?: Despite its generally lighthearted narrative, there are many scenes (and several episodes) that are decidedly dark. Several characters are executed onscreen quite graphically, the heroine tries to commit suicide at one point, and later, shoots her father, Nemo, while under Gargoyle's control. There's also a brief instance of racism and, near the end (between episodes 30 and 31), Nadia spends nearly two full episodes nude.