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.
Character Rerailment: In the first movie Booger calls the Mu's "pigs" but comes to love them, then in the second movie he only hits on the conventionally attractive girls. And in the third and fourth movie he's back to Ugly Cute Mu's.
Invoked with Lewis in the third film. He's become successful and has ditched his nerd persona, only to take it up again towards the end of the movie.
The use of Queen's "We Are The Champions" at the end of the first movie, arguably the most effective use of the song in any media.
The "No on 15" song in the second movie.
Designated Hero: The Tri-Lambs' revenge on Betty Childs is hardly the actions of the nice guys characters they are supposed to be. Granted she was a Grade A bitch but putting secret camera's in her bedroom, selling naked photos of her taken without her knowledge or permission to the ENTIRE SCHOOL and tricking her into having sex by making her think she's having sex with her boyfriend - which actually fits the legal definition of Rape by Deception - is, to say the least, grossly Disproportionate Retribution and would easily get someone registered as a serious sex offender in real life.
Life Imitates Art: While the film series as a whole still has a devoted following; younger, casual movie fans may see the premise as outdated, now that Bill Gates and Paul Allen masterminded the true "Revenge Of The Nerds" in real life. Nerd/geek culture is far more mainstream among men and women today than in the 1980's and early 1990's.
Seinfeld Is Unfunny: This movie was a huge hit back when it was released and basically kickstarted the teen sex comedy genre, but it has not aged well at all. Changing social attitudes and general Fridge Logic has transformed the plucky, Nice Guy protagonists into sociopathic rapists in the eyes of viewers. And that's not getting into all the stuff that other movies stole from this one, making Revenge Of The Nerds come off as rather stale to some.
Putting cameras in womens bedrooms to spy on them naked, taking photos of someones breasts and selling them in a carnival and tricking someone into sex by pretending to be their boyfriend would definitely not be considered a justifiable response to bitchy behavior these days but in 1984 we were expected to cheer out "heroes" on for this.
There's also the fact that they have a minor involved in all of this: Harold, the child prodigy.