If the exact movements of kerry's previous ship had any relation to the Swiftees' accounts of his Swift boat service, I might agree with you, but they don't.
They do matter, though, when they're used to discredit as a fake kerry's story about the MLK assassination and his being in Vietnam at the time.
"A minor error that impacts none of the rest of the book is just that: a minor inconsequential error."
I strongly disagree. If only one fact is wrong, bent, twisted to make a point, then it brings into question all the 'facts' in the book. It also raises serious doubt about how truthfull the SBVT really are. They are challenging the truthfullness of someone else with facts that are not correct (untruthfull)and that doesn't flush - sorry.