It sounded to me that Roberts didn’t take the traditional swearing-in-rhythm, and it sounded confusing. I don’t get trying to make political hay out of this anyway. It was smart of them to redo it since this is the only oath with exact wording as prescribed by the Constitution.
Burger paused after "solemnly swear" when Reagan took the oath. Rehnquist paused after "George W. Bush" at the last inaugural, and after "solemnly swear" when Bush's father became president. If somebody's interested, they could probably rustle up other previous inaugurations on youtube.