dizzy score keeper

[bbman]

Here's how I remember the situation: (middle school game).
Scorekeeper is told by the home team(white) coach to just copy yesterdays lineup into today's score book. No problem so far.
(fyi, #1 white changed into #3w jersey w/o telling his coach before the game started).
#3w not listed in book, just #1w.
Game is started, #3w gets into the game w/o the officials being notified. #3w commits a foul, score keeper, who realizes that #3w s/b #1w, just logs the foul in #1's box in the score book. Play continues, dead ball, #3w gets replaced by #12w. After a few minutes of playing time goes by, a time out is called. During the time out, coach from blue team says # 3w was in game illegally.

Comment: It's too late to penalize. (Can penalize if & when #3w does re-enter the game).
Questions:
1. The foul that was charged to #1w, how does it get corrected in the book?
2. Can #3w go to the locker room and change to #1w?

Thanks in advance, I'll be back after I down a few Miller's.