The most noticeable characteristics of headpastes is the usually disproportionate size of the superimposed head in comparison with the body. The pasted head could have a different lighting and shadow than the rest of the video, and if not done correctly, would not sync perfectly with the rest of the body, resulting in the head 'drifting' away from the body erratically. Owing to the fact that the pasted head are merely images, it does not turn smoothly, and the mouths don't usually move when the character speaks.