1) The document discusses a film poster design that uses conventions like including the title, release date, and main image while breaking conventions by not including a tagline or description of the unique selling point.
2) Specific design choices are explained like keeping the main image in black and white to fit the horror genre and "smudging" the text to appear ghostlike.
3) The poster aims to create mystery and focus attention on the main image by omitting explicit details about the plot or storyline.