I always thought that PNRs would show who made the modifications and allowed whatever. So, unless it is the GA's responsibility to catch and rectify these things, she should not be reproached. I have had it happen now and then that a reservations agent would look at a rather convoluted and complex booking with multiple waitlists and other things and remark "you know, they should not have done xxxx but I'll leave it alone because I don't want to inconvenience you...". I would also say that, even without a sense of entitlement or the OP trying to game the system (both of which he did not), this "correction" costs more than it saved.