PK Rule clarification please

[SamG]

This happened while watching my son's youth soccer game this weekend, and I have some questions (because I don't know the rules well enough)...

Situation
PK awarded to Team 'A'. Everyone outside the area, A1 lines up the ball, etc. The kick hits the crossbar, goes straight up in the air, then back down in the field of play. Before anyone else touches the ball (more on this in a moment), A1 kick the ball into the net. Referee signals 'Goal'. Team B coach goes ballistic saying A1 can't kick the ball until someone else touches it. Referee ignores him.

Questions
1) Is the coach correct (from what I've read in Rule 14 it seems so, but I want to make sure)?
2) Can the center official "ask for help" from the AR's if he's unsure of the rule or who played the ball?
3) Are the AR's allowed to tell the Center official what they saw even if not asked?

Full Disclosure
I did not pay attention to WHO took the kick and was blocked out on who actually took the shot that went into goal. I'm ASSUMING the coach is correct on what happened.

My son's team was 'B'.

The game ended in a tie (the goal after the PK made the tie)

This was a game for third place (so no affect on medals)

After the game, I heard B's coach tell his players (who were obviously griping but I couldn't hear them) "it happens sometimes".

I am trying to learn what should have happened and what could have happened (as far as an "officials conference").

Thank you.