Examples 2:
Anticipating taking courses, doing research, running a club, or shadowing that never comes to pass. Or the opposite. Or a late grade change that boosts post bacc GPA over a couple points. Or accidentally add a year of an extracurricular with office held? You said you were in a club, but are not listed as such due to not paying dues or joining late? Being a year off on work history for a job?
EDIT: I have not submitted AMCAS yet. I am doing my due diligence and am trying to figure out what is more important and less important, and where to draw the line in terms of getting information perfect.