All decisions and determinations of the council, upon notice and hearing, shall be final and conclusive upon all persons entitled to appeal, as to all errors, informalities, omissions, and irregularities which might have been avoided, or which might have been remedied during the progress of the proceedings or which can be remedied, and as to illegalities not amounting to a want of due process of law.
(Ord. 1586 §11 ( part))