I'm a life long NYC area resident and recently retired realtor. First of all, NEVER rely on websites telling you where the "nearest subway" stop is. Real estate websites like Zillow, Trulia, etc. have only 1 goal - to get consumers like you to use their websites and available information. This does NOT mean the information on their websites is useful to you or how accurate it is. Real estate agents pay $$$ to these websites to advertise themselves hoping that people like you will call them to assist you in finding your next home.
As for the subway system map on Trulia, all Trulia is interested in is giving you POSSIBLE subway stops nearby - NOT every single subway stop. That is your job to locate the actual subway stop near where you are looking to live. I've noticed that Trulia will indicate the "express" stops - more than the local stops. There is also space limitations so Trulia does not have the space to fit in all the local stops.
What you need to do is print out the subway map system from www.mta.info and compare the listings to the subway map. You can also use Google Maps to help you.
You did not indicate if you are renting or buying. I do want to help you save money. Have you looked in the nearby suburbs? You need to. Both rentals and buying homes is MUCH cheaper in Nassau County (Long Island) or Westchester County (above the Bronx). Examples of savings: a typical 2 bedroom 2 bath rental = $3 -4,000. depending on location. A typical 2 bedroom 2 bath co-op sells for $350,000 - 400,000. These prices is for a move in ready unit in a good neighborhood. Also the rooms are normal size - not teeny tiny like Brooklyn. Commuters to Manhattan will take the Long Island Railroad to Penn Station or MetroNorth to Grand Central. From there, they take the subway to work. If you work in Brooklyn, it will be much easier to live in Nassau County and drive. Finally, owning a car and parking is much less restricted compared to NYC + parking tickets are much cheaper.
Hope this information helps.