code: function () {
  			var completed = app.todos.completed().length;
  			var remaining = app.todos.remaining().length;
  
  			if (app.todos.length) {
  				this.$main.show();
  				this.$footer.show();
  
  				this.$footer.html(this.statsTemplate({
  					completed: completed,
  					remaining: remaining
  				}));
  
  				this.$('#filters li a')
  					.removeClass('selected')
  					.filter('[href="#/' + (app.TodoFilter || '') + '"]')
  					.addClass('selected');
  			} else {
  				this.$main.hide();
  				this.$footer.hide();
  			}
  
  			this.allCheckbox.checked = !remaining;
  		}
docs: Re-rendering the App just means refreshing the statistics -- the rest of the app doesn't change.