#1: It looks like the foul on Blue #42 is whistled first. If that's the case, the foul by White #2 would be ignored unless it was flagrant.
That said, the officials should get together to see if they can decide which foul came first. If they can't decide, a simultaneous foul would seem to be the appropriate call. (I don't know why the video asks about a multiple foul since this play is not the definition of one).
#2: I agree with those who say the shot is airborne when the foul occurs. Count the basket and administer the foul. I had three similar plays happen to me this past season.
#3: Yuck. With both officials together at the end, they definitely have no idea who left the bench, etc. From what I could tell from the video, it looks like everyone but #12 white is involved in the post-game tussle. So, I'd say toss everyone, but him. 😀
I'm not sure what triggered the PC foul at the beginning of the clip. The camera doesn't show what happened to warrant the foul call.