Is it worth mentioning that in the emergency room flashback scene Jack has to make a decision as to which of two car accident victims to treat, and, choosing his future wife, the other victim, Shannon's father (Mr. Rutherford) succumbs to his wounds?  The reference is fleeting and easily missed, so is it legitimately something worth mentioning?  Or is it something best left for a reveal in a future ep?  Just asking.   kjdamrau