Back OT:

I spent way too much time of the 757 (4 of them in face) during the last trip. On the first flight, the coach FA announced "3 L and R prepared and cross-checked." The purser held up 4 fingers, mouth the words 4 L and R, and next thing we heard was "4 L and R prepared and cross-checked".

I always thought the back exits are 3L/R. Has that changed?