Three false claims about the election made in Mike Lindell’s new film.

Many of these unsubstantiated claims stem from an instance in Antrim County, Mich., when a clerical error in reporting results led the county to initially show a landslide vote in favor of Mr. Biden. The error was soon corrected, but conspiracy theorists have latched onto the incident as evidence that voting was rigged.

Files “were deleted from the Dominion system in Antrim County. We know that for a fact,” Matt DePerno, a lawyer who has fought to investigate the incident, told Mr. Lindell in the film. “Wow,” Mr. Lindell responded.

There has been no evidence that votes were manipulated in the county, and a hand-counted audit of votes in December affirmed the outcome there.

Mr. Lindell interviewed retired Army Col. Phil Waldron, another member of the movement that fought to overturn the election. Mr. Waldron, who said his military background involves “information warfare,” pushed the unfounded claim that the Chinese government invested money in Dominion and therefore has access to its files and data.

“A lot of movements of votes, direct access to Pennsylvania voting precincts, county tabulation centers, Wisconsin, Michigan, Nevada, Arizona, Georgia, all of that coming directly from foreign countries, China being the predominant one,” Mr. Waldron said.

He also claimed that overseas servers in Germany, Spain and the United Kingdom somehow played a role in manipulating results. The manipulation, Mr. Waldron said, was “part of a coup that was aided and abetted by a foreign-threat nation-state, a peer enemy nation-state: China.”

Election officials and cybersecurity experts have said there is no credible evidence that China helped Mr. Biden win the election.