First person, part the second

Another thing that it is really important to pay attention to in first-person writing is what that character knows. Not what he/she knows about the plot; that should be obvious. About everything else.

When your first-person narrator looks at the street outside his house, does he see Fords and Chryslers and Saturns? Or does he see red vans and silver cars and a blue pickup? In other words, is he the sort of person who knows all the makes and models and maybe even the year, or are they just all ...