1st action :
No foul from the keeper. The striker is the one charging, he's only going down because he's so much lighter than the GK.
BUT, it's a head injury, so the ref has to stop the time, especially at that age, and he has plenty of time to do so before the goal is scored.
He doesn't deal with the coach "what do you want me to do, I'm not a doctor !", yes, so what was he gonna do 10sec earlier anyway ?
2nd action :
I don't quite see what the GK have done, but the two whites players clearly deserve a yellow as well
3rd action :
Red card is good I think
Maybe a yellow for the push of white 10