Interesting resolution at the end of the Film!
THE TRIM WHEEL!
The most important device in the Cockpit.
All of my manual flights are carried out with one hand on the Yoke/Joystick, and one hand on the Trim Wheel!
Adjust trim before take-off, trim for level flight, trim for landing, and ALWAYS re-adjust Trim Wheel whenever the Autopilot is disconnected, (either automatically, manually, or accidentally)!
It appears that the Pilot(s) failed to check this when the Aircraft was set from faulty Computer Control to Manual Control!
It was fully trimmed skywards, and if anyone had noticed, the aircraft was already far too low, and it was too late to correct the Trim manually!
Always keep a wary eye on the centre-marking on the Trim Wheel and make sure its not way adrift from the centre, either up or down!
A fascinating documentary, and an illustration on how easily things can go disastrously wrong in a highly complex, fully automated aircraft!
Paul.. I like ancient controls and gauges!...

...!
P.S..... I have fitted "Angle Of Attack" gauges in many of my regular GA aircraft to observe the effect! (There is a very nice analogue one in the Default FSX Learjet 45).