...but you wouldn't be able to stack anything in a falling elevator.

Also, forget internal organs. Well, not completely, but having them mostly intact isn't going to help you much if your the fall has driven your femur up through your pelvis and made a proper mess of some rather important arteries. My procedure for nightmare-falling-in-elevator-scenario is a) protect head with arms - adopt the brace position b) Lie as flat as possible to avoid aforementioned projectile leg bones c) get as close to the floor of the lift as possible.

but yeah, you're probably fucked.

You should press all the buttons for floor 1-5 before crashing, that will slow down the elevator when it comes close to the floor.

I'm guessing purely from a forces standpoint that if you were stood up, you'd be a lot more likely to survive than if you were lying down, like the video says. Mainly because your internal organs and brain are about to be decelerating, and you want to minimise the deceleration as much as possible. Your extremities might get pulverised, but without the organs they're not much use anyway.

There's some historic example about a 1945 bomber crashing into the Empire State Building, severing the ropes and inducing free-fall, but the lift's ropes coiled up and cushioned the occupant's fall and they lived. I just looked it up, and apparently only several times has free fall ever happened, only killing one person. But apparently people die from falling in the shafts, mechanics caught in machinery and strangulation from scarves caught in doors.

Meanwhile in Korea.

Just open the door and step out right before the elevator hits bottom.