Your PTA may desire to appoint auditors at the start of each session. It is their job to keep notes along with the secretary and then review them at the end of the session to be sure no action taken has been missed. It is a good practice to sign the secretary's handwritten notes as an endorsement of accuracy. Minutes may be corrected when an error is noticed, regardless of the time lapsed, even years later. Corrections to the minutes, possibly in red, should be made in the margin, never by erasure.
Corrections are to be initialed and dated.
If a question does arrive on accuracy of a particular action in the minutes, then a vote of the members is taken to determine how the entry will stand and be corrected. Do not regard as a correction an action that was accurate at the time, i.e., a date that was scheduled and later changed. The secretary did not make an error but circumstances caused the change. Minutes normally are read and approved at the start of the next regular session. If a special meeting is called, minutes of the last regular meeting ARE NOT approved at that session.