The actual tiles are bigger and better looking than these. Even with these though you can see the tile has all you need to play. Doors and windows are marked, each door has "lock" icons to show how hard it is to open. The "!" and "?" icons tell you where to put the bad guys and the grid tell you how to move.
No, it's not a mistake, you can move faster outside than inside, that's why the squares are bigger. Of course, crossing the street is a little riskier, so you have to slow down and look both ways...