The flyDubai B-737 attempted takeoff without clearance while a Russian Aeroflot A330 was crossing the runway. Euro Control has introduced Runway Status Lights being used at Paris airport, which is a safety barrier for such incidents.
The El Al B-789 managed to get airborne safely despite the 40 Tonne error in weight while calculating the takeoff performance.
I have written a paper on how and why humans commit such grave errors and ways and means to prevent them.
This activity involves pointing at target objects by stretching your arm and stating out loud, “Such and such is OK” at important points in the work in order to proceed with work safely and correctly.