After the fight with the Chinese agent, McGarrett has a badly busted and bloody lip. When agents Miller and Greer come in a moment later, McGarrett's lip is perfectly healed with no blood to be seen.
The bad gut enters the dead agents apartment and starts to burn pages from a notebook. By the time Steve and Danny get there these pages should have all burnt away and yet Steve finds enough pieces to find two whole words as clues. The way the pages were burned meant that IF there HAD been pieces left they would have had straight edges with no signs of any words at all.