Shuttle poised for launch: Expect delays

Image: ISS, Servicing ISS, ISS Group Shots

NASA administrators won't be pleased to hear someone was leaking information to the media (gasp!) but it can't be helped. People want to know if the launch is a "go" or a "no-go." As it turns out, it's most likely a "go" about a week later than they previously anticipated.
What puzzles me is this: What kind of incomplete paperwork could delay a Space Shuttle launch?
Did somebody forget to read the instructions?