Misaimed Fandom: Guess what quote is used to justify antisocial behaviour. Sartre had to clarify that he didn't mean hell was normal social interactions with other people - he meant that people make their own hell by being assholes to each other; conventional torture isn't needed because the dysfunctional relationships that the asshole victims of hell form with each other is torture enough. In other words, "Hell is other people" is not the same thing as "Other people are hell".
Moral Event Horizon: None of the characters are there by mistake. Let's see: Ines murdered her cousin because she was in love with his wife, Garcin abused and tormented his wife, and Estelle threw her own baby to her death and then drove her lover to commit suicide.
Older Than They Think: No Exit is often thought of as the Trope Maker for a Hell where the punishment is being with the rest of the tortured you're with. That concept can be traced back to The Divine Comedy if in a much more unrefined form, where Hell increasingly goes from largely asocial to dangerously anti-social, with thieves stealing each other's bodies, liars beating each other verbally and physically for eternity, and mouths being transfigured from methods of communication to methods of cannibalism in the Ninth Circle.
Spiritual Adaptation: The first season of Michael Schur's The Good Place is pretty much a shockingly well-done adaptation of the play, albeit reinvented as a wacky American sitcom. The series' showrunner even explicitly described this play as a major inspiration for his show.
Catharsis Factor: Ash is a child kidnapper and sex-trafficker and is openly petty and antagonistic towards Darby after the twist is revealed. He also kills Ed and tortures Darby some more by nailing her to a wall and reads a text from her sister that reveals her mother died. By the time Darby is able to turn the tables on him and stab him in the throat with a screwdriver, you'll be cheering at the prolonged death he suffers.
Critical Dissonance: Critics were noticeably mixed on this movie at release, dismissing it as a popcorn movie. Audiences, on the other hand, praised the film for its suspense and action sequences.
Crosses the Line Twice: The thought of a defenseless child like Jay getting kidnapped? Horrific. Jay being revealed as being something of a brat, and Sandi being shown emotionlessly listening to her getting abducted with the vacuum cleaner off in retaliation for Jay mistreating her? Hilarious.
He Really Can Act: A twofer example. Many praised the performances of Havana Rose Liu as a badass and capable Final Girl and Danny Ramirez as a monstrous child kidnapper and trafficker. The latter is especially impressive as he's mostly known for a minor role in The Falcon and the Winter Soldier.
as a major inspiration for his show.