The majority of the film's narrative is driven by cause and effect, with Harry's actions influencing how the story unfolds. A great example is when Harry and Wilson steal a police car, the repercussions of this action are not fully realized until the end of the film. If Harry and Wilson hadn't stolen that car, Wilson wouldn't have shown up later in the story, riddled with bullets and asking Harry to mercifully kill him. Perhaps the best example is what drives the entire narrative forward, what causes Harry to miss his date with Julie and hear the phone call. The only reason Harry hears that phone call is because he threw away a lit cigarette, which a crow picked up and then dropped onto its nest which appears to be resting on power lines at the top of Harry's apartment complex. De Jarnatt's script is all about cause and effect and this makes for a really exciting and entertaining narrative structure as it constantly leaves the audience wondering what Harry will get himself into.