In case anyone has received a strange email from Cunard with the subject line was "Missing Immigration Information" and with an attachment "MissingImmigratnNotice-[trip reference number], here's the story: At some point the US version of the web site site didn't have a field for your emergency contact's state (of the Union, that is). (This was found under Personal Details on MyCunard.) This now needs to be filled it, but at the moment the entire Emergency Contact section has disappeared, probably for repairs. Only a phone call will fix it.
This leaves a couple questions, probably all unimportant:
Is this true for places other than the US?
Why is this considered "Immigration" information?