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.
Evil Is Sexy: The teachers all dress a lot more sharply after they fall under the aliens' control. It's most noticeable with Miss Burke, who was a Shrinking Violet before getting infected and turning into a sexpot, but it applies to all of them.'
Delilah as well, too a lesser extent. The class Alpha Bitch and easily the hottest girl in the school
Genius Bonus: Early in the film, after being begged by Mrs. Olsen for the (nonexistent) funds to put on a musical, Principal Drake suggests recycling the sets from Our Town to save money. As any theater geek would know, Our Towndoesn't use a set. This makes Drake seem even more callous and unconcerned about anything other than the football team — she either couldn't have been bothered to see her own school's theater production (the only way she wouldn't have known that fact), or she just told Mrs. Olsen to fuck off.
Harsher in Hindsight: One scene in this film involves a character shooting his high school principal in the face. This film was released four months before Columbine.