Nicholas J. Michalak said:

Maybe I'm not entirely opposed to seeing Hayden there, but one, it just doesn't make any sense at all to me. Secondly, it looks like Lucas just took a random outtake of Hayden and spliced it into the shot. It comes off as a half-assed attempt. If it was done with some care and real thought behind it, the end result might be more acceptable.

-NJM

Exactly. If you look closely, you will notice that the only thing replaced is Shaw's head. His body is still there, just with Hayden's head on top of it. THAT is half-assed.