Update (10/28/22): In leaked audio of his speech to the Election Integrity Network meeting in New Mexico, Eastman can told volunteers to "“Document what you’ve seen, raise the challenge. And [note] which of the judges on that election board decline to accept your challenge. Get it all written down" because “That then becomes the basis for an affidavit in a court challenge after the fact.”
He also advised the crowd, “You are allowed to make a written record of anything you see not going on correctly. That’s called creating evidence,” saying it would become the basis for “legal challenges if we need them.”