Dummy's rights

In the 2017 Laws:
L43A1(b): Dummy may not call attention to an irregularity during play.

L65A3: A player may draw attention to a card pointed incorrectly, but
this right expires when his side leads or plays to the following trick.
If done later Law 16B may apply.

Which of the above takes priority?  That is, when if ever can dummy 
point out a card turned incorrectly?

For a too-late correction, I don't understand how L16B is relevant.  The 
number of tricks won and lost is always AI.  It seems to me the relevant 
Law would be 12A1 (in essence, the Director estimates what would have 
happened if the infraction had not occurred).  Can anyone explain?
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