Marriage Act 1961

A marriage under this Part is not invalid by reason of all or any of the following:

failure of the parties, or either of them, to make or subscribe a declaration required by section 74, or a false statement, defect or error in such a declaration;

the fact that the marriage was solemnised in contravention of any provision of section 72, 74, 75, 76, 77 or 78;

failure to comply with the requirements of section 13.

A marriage under this Part is not invalid by reason that the person solemnising it was not an authorised celebrant if either party to the marriage, at the time the marriage was solemnised, believed that that person was lawfully authorised to solemnise it, and in such a case the form and ceremony of the marriage shall be deemed to have been sufficient if they were such as to show an intention on the part of each of the parties to become thereby the lawfully wedded spouse of the other.