* DarknessInducedAudienceApathy: Given the gritty nature of the film, it can be hard to root for the cops themselves, up to and including Ludlow and Biggs.
* HilariousInHindsight / HarsherInHindsight / RetroactiveRecognition: One of the Korean gangsters that Ludlow insults goes on to play Jim Morita in ''Film/CaptainAmericaTheFirstAvenger'', while Cap himself is Ludlow's new partner.
* MoralEventHorizon: [[spoiler:Captain Wander]] crosses this when he reveals his true colors.
* SpiritualAdaptation: This film is probably the closest anyone will ever come to making a decent ''{{Max Payne}}'' adaptation.
* SpiritualSuccessor: To ''{{Training Day}}'', which director David Ayer wrote. At one point, it was a full-blown sequel focusing on an older, more jaded Hoyt.
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