There are two books. Each one should know all the team members, and if "Bob" checks in as number 4, and he sees that "Steve" is in the book as number four, he should catch it right away.
From my experience, by the second quarter, I can pretty much match a face up with a number for the kids who are playing the lion share of the minutes (especially if it is the second or third time I have them in the year). If my crew has called 3 fouls on two different #4's, I think we might have noticed as well. Granted it would take us much longer to notice than it should take the scorekeeper.
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