There is a very important lesson to be learned here.
ALL people who handle a gun,
especially if using it in a movie scene or whatever,
need to check the gun right then and there,
to confirm whether or not it is loaded,
and with what kind of ammo.
DO NOT assume that the gun is in the same condition
as it was the last time you saw it!
I would recommend that, for any movie or TV show or whatever,
if any gun is to be used anywhere in the production,
the entire cast and crew should be given a gun safety course.
There are many courses out there, for free,
from the NRA and from other sources.
If Alec Baldwin had studied any of the NRA's safety courses,
instead of propagandizing against them,
he would not be in trouble right now.