Martin Scorsese (director) always loves details in crime films, but he is not primarily interested in the crime itself. That is why his films are always produced with details that you may see as unimportant to you, especially if you want to see the movie for the purpose of seeing scenes of theft, murder, and so on, but you see the opposite. Somewhat other details are visible on the scene mostly

The film talks about liberation, stereotypes, and entering a new world for humanity. It was Ray Liotta (Henry). He wanted, as I said, to break free from stereotypes and enter the world of gangs.

Martin Scorsese (the director) filmed this unfamiliar life and directed it in the form of a film similar to documentaries because he filmed it as if it were a real, realistic life. That is why the presence of Voice Over was important in order to give you the feeling that there is a person sitting next to you telling you the story while whispering in your ear as it happens in the movies documentaries.