The main character does not get the girl at the end of the movie like every other film...
Like I said - BR was ahead of its time!
some things that set returns apart from the other 3 films in it's continuity;
-as mentioned the only one where Bruce ends the film 'single'
-the only one where the opening scene does not feature batman. Also the only one where we see Bruce out of uniform prior to seeing him as Batman
-the only one where Batman is not in the final shot of the film.