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.
Family Unfriendly Aesop: "Kids, if you get into trouble with an armed assailant, don't bother calling the police. You can dispatch him on your own."
Of course, ultimately they were successfully kidnapped, as well as having put Emily in danger, by not getting her to call the police as suggested. Maybe the real Aesop is to be supportive of your kids so they don't feel like they have to prove themselves by getting into dangerous situations.
"Funny Aneurysm" Moment: In the original film, when the titular ninjas were returning home from their summer break with their grandfather, they joked about murdering their teacher, though they never made any indication that they would actually do it. Long after the release of this movie, there have been several high-profile school shootings, Columbine being the most famous. And no, this movie was not the impetus for the killings.
Sequelitis: Somehow this movie managed to spawn three sequels, with each later installment decreasing in quality.
Impressively, they managed to keep the sequels in order of decreasing quality even when releasing them out of order.
