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: The Toxic Avenger
Big Lipped Alligator Moment: Okay... exactly when did Melvin gain the ability to transform into a sexy blonde reporter chick, and why does no one comment upon this in the fourth movie?
Complete Monster: Bozo in the 1st movie who runs over a kid on bike simple for shit and giggles.
Pretty much all the villains from the first film - and the ones that followed.
Several from the musical, but in particular is Bitch/Slut/Liar/Whore, which features a duet sung by one person.
Dude, Not Funny!: The beginning of part 4 starts of with a school shootout in a special ed class room and was stated to be a reference to Columbine. Which only happened a year prior. Even if it wasn't cracking wise about a recent massacre, mocking the mentally disabled is pretty low no matter what standards.
Nightmare Fuel: The original has quite a bit, especially since it's a comedy.