Why did she need a passport, at age 17 and “living in Hawaii”?
Perhaps to cross the border from Washington State into Canada - to give birth to the thus non-US citizen baby Barry...
and to then return to the US 3 weeks later, to attend the University of Washington in Seattle - and visit her high school chum on Mercer Island.
You have hit on my favorite theory. Unwed Mothers home in Seattle area used a Canadian hospital for their deliveries.
I read those facts long ago and still feel a “tingle” about them...Most other scenarios don’t do that to me.
Actual father?