One of the most important details to emerge from Book I, Chapter 4 of Orwell's work is the discussion of Winston's job at the Ministry of Truth. It is through Winston's professional being that one gains full insight into how the Party holds so much power in Oceania. An important detail is here is how language is reconfigured, stressing one of Orwell's points that language is a form of power. Words, writing, and composition of thought is an act of resistance in Oceania. This becomes one of the most important details to emerge from the chapter.
Another detail to emerge from chapter 4 is how the Party benefits when individuals are in competition with one another. Winston speaks of how there is a competitive element amongst the workers. This helps to underscore how the Party and Big Brother reject any idea of solidarity. Big Brother and the Party benefit when individual citizens compete against one another because it precludes them from creating bonds of solidarity against those in the position of power. Ensuring that individuals compete against one another and not ask the critical questions about their being becomes part of the Party's mission and the purpose of Big Brother. This is seen in the picture rendered in Book I, chapter 4 of Orwell's work.