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.
Harsher in Hindsight: Mr. Keating breaking down in tears after he discovers that Neil killed himself has now just become a thousand times worse to watch now that Robin Williams himself committed suicide.
It also makes Mr. Keating's speeches about "carpe diem" and seizing the day before it's gone heartbreaking.
Ho Yay: Neil and Todd. It's virtual canon, to the point that most of the fanfiction circles on them.
Jerkass Has a Point: Keating's antics don't go over well with the school administration and teachers. He has at least two conversations about this during the course of the film. While the audience is set up to believe their adherence to tradition and conformity are a bad thing, both conversations drive the point home. "Free thinkers at seventeen? Teach them to learn and the rest will follow." A prep school education is designed to send the young men on to college, and trying to be an artist will only end in disappointment.
Launcher of a Thousand Ships: Charlie is paired with nearly everyone in fanfiction, mostly under the logic that he probably wouldn't object.
Memetic Mutation: The "carpe diem" speech got a lot of play on Tumblr in the wake of Robin Williams' death.