President Barack Obama made one factual error in his first speech in office when he said, immediately after being sworn in:
Forty-four Americans have now taken the presidential oath.
It is true that Obama is counted as the 44th president, but he’s only the 43rd person to take the oath. Grover Cleveland is counted as both the 22nd and the 24th president.
Cleveland took the oath the first time in 1885, served four years and then was defeated by Benjamin Harrison in 1888.