Pick a number, report the foul and finish the game.
IN LIGHT OF BOTH OF THESE:
Like you said above, you just don't let it happen (not getting the foul-er's number--which is just testament on how much we have to pay attention.) The best remedy is to just not let it happen, but I am sure there is not a person/referee in here that has NOT had that happen to them. Right ya'll?
So, basically, be always aware. Remember to get the number, even if you have other extra-curricular stuff/players to ref (especially during a dead ball). We just have to train ourselves. "Practice, practice, practice," as A.I. (#3) would say.
can you, by rule, consult the scorer in this case?
As for this, you bet. By rule, you may confer w// the scorer on any 'correctable error,' admin. So, go for it. One problem w/ doing this, though, is two-fold: 1) It takes too long, and 2) you look uncertain and doubting which takes away from your credibility as an official.
So, hopefully, this helps out. I just try to remember that my game administration has a lot to do w/ how I'm accepted (esp. w/ the close calls) on the court. Good luck and welcome to da boards!