A man saying he was the writer and director, and claiming to be Sam Bacile, spoke to a number of media outlets on Tuesday, making inflammatory anti-Islamic comments in support of the film.
He claimed to be 52, or 56, depending on the source, and to be an Israeli-born Jewish estate agent who had raised millions of dollars from Jewish donors to make the film.
But prior to last week he did not exist online, except as the YouTube posting name, and there was no record of a developer of that name.
Questions started being asked over whether Sam Bacile was a real person.
An American right-wing extremist called Steve Klein, linked with various anti-Islamic groups in California, promoted the video, but said he did not know the identity of the director.
He contradicted himself in media interviews while expressing radical views, and eventually admitted he thought Sam Bacile was just a pseudonym.
Pastor Terry Jones from Florida, whose anti-Muslim actions have included burning Korans, said he had been in touch with a Mr Bacile over promotion of the film, but had not met him and could not identify him.
Another name appeared linked to the film - Morris Sadek - an Egyptian American from the anti-Islamic National American Coptic Assembly.
His promotion of the movie brought inquiries into the involvement of Coptic Christian groups.
The Copts make up a sizeable Christian minority in Egypt and some have raised concern about their religious freedom in the new Egypt under a Muslim Brotherhood president.
The Associated Press news agency, which had interviewed the man claiming to be Sam Bacile on the telephone, then followed a trail to a Californian called Nakoula Basseley Nakoula, 55, who told AP he was a Coptic Christian and admitted he was involved in logistics and management of the film's production.