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: Requiem for a Dream
Award Snub: Ellen Burstyn's heartbreaking performance as Sara lost the Academy Award for Best Actress to... Julia Roberts in Erin Brockovich. And the film didn't get a single other nomination, not even for Original Score, Cinematography, or Film Editing.
Regarding Burstyn losing to Roberts, you can chalk it up to Burstyn having won decades previously for Alice Doesnt Live Here Anymore, and Roberts being at the peak of her career and up til then unlauded for it. That's just how the Oscars work. The snubs of other categories, however, are outrageous.
Particularly the score. This, just listen to it. This track is not merely very good, it has become part of the musical lexicon on a scale comparable with Mozart's Eine Kleine Nachtmusik.
The remix of the main theme practically has a life of its own now.
Narm: The excessive cuts, overly dramatic music and oddly music video feel of some scenes can make them a bit hard to take seriously. Going by comments from the director, this may have been intentional though
One-Scene Wonder: Christopher MacDonald as the "JUICE" infomercial/motivational speaker Tappy Tibbons, whose program Sara watches and she believes she's getting invited to as a "contestant". They filmed an entire presentation of the "JUICE" program one day with MacDonald improvising most of it. At the end of the shoot, everyone in attendance gave him a standing ovation.
Little John, simply for being played by Keith David.
Dylan Baker as the doctor who turns Harry and Tyrone in. He squeezes quite a lot of performance into a minute or so of screentime.
Seinfeld Is Unfunny: The film's use of the "hip hop montage", a series of rapid cuts accompanied by sound effects, looks normal now, despite the fact that this was the film that popularised its use (Aronofsky previously used it in π.) This extends to the point where The Simpsons used a similar montage to show Homer's reaction to eating a McRib sandwich, which McDonald's themselves then copied for a bacon wrap ad.
Special Effect Failure: As sad as the film's ending is, it does get ruined when one notices Jared Leto's real arm pressed up against him can be seen under the blue sheet, and when people can see the cotton on the ground masquerading as snow (when the ladies try to console each other after seeing Sara) and that it was clearly shot in a summer day.
Tear Jerker: Special mention goes to Sara's monologue about growing old. Notice how the camera seems to move out of focus? It's because the lens was fogging up because the cameraman was tearing up.
Or, you may think that this film is a subversion of this trope: that this film is a masterpiece despite the huge levels of angst.
The Woobie: Besides, you know, everyone, Sara in particular comes off as the most sympathetic, having never gotten involved with the drug trade and simply wanting to have something to live for again. She plays the most part of a victim, being neglected by her son and doctor and appearing generally unhappy and lonely. Especially since she only wanted to lose weight and wasn't trying to get high in the first place.
She is also a loving mother who genuinely cares greatly for her son, and this love seems to extend to Marion (whom she fantasizes about marrying her son, implying that she already thinks of Marion like a daughter and feels that Marion is a good match for him).