One little letter missing can make such a big difference.
As Eric Pfeiffer said on the Sideshow on Yahoo! News:
Still, it's interesting how much fuss the omission of one letter can lead to. No one was killed, no one lost their job and any concerned parties can rest assured that they will have a corrected commencement program to reflect upon in the future. But it's not going to stop the critics of the world from expressing their outrage at the fallibility of others. Though for most of us, it will probably be remembered with little more than a quick laugh.