Watch the safety demo that you have seen a million times...it simply reinforces what you already know, and in a high adrenalin situation, people do what they know, what is familiar to them.
For example: the seatbelt demo.....an airplane seatbelt opens differently than the way you open your seatbelt on your car, which you probably do hundreds more times than unfastening on a plane. In your car...you PUSH THE BUTTON...in a plane, you LIFT UP on the top plate. People are delayed because they do what they know in a high adrenalin scenario...they try to push the button.
Count rows to the exits...mentally say I am in row 3, row 12 is the exit row, should the forward exits be blocked.
Put your belongings all the way under the seat...they can slow you down as you are trying to evacuate an airplane. That big ol' bag that is sticking out and someone is trying to hide with a blanket or their legs so the FA doesn't make 'em move it...it can be your worst enemy in a crash. Besides the twisted metal you'll have to cross, you'll be tripping over your suitcase, too. Don't take anything with you. Really....leave the laptop.
Have your window shades open for taxi, take-off, and landing...gives you a visual of what's going on outside during critical phases of flight. (helps you see if there is fire, water, debris, etc on your side of the aircraft.)
Don't wear your noice canceling headseats, or earbuds during critical phases of flight (taxi, take-off, landing) They reduce your capacity to hear evacuation commands. Also, the wires will get in your way or will trip someone else up as they struggle to follow you and you have dumped them on the floor and they get tangled up in them.
If you are in the exit row...take a look at the safety card..and really know how the door operates. Each aircraft model is different.