Robert Thorn (Gregory Peck) finds the triple 6 on his son, Damien's head, beneath his hair. The nanny tries to kill Thorn but he kills her. Thorn rushes to a church with his son and the police pursue. In the church, he's about to kill his son with the daggers and the police shoot. For a moment, we don't see if Thorn killed his son or not. The scene changes to a funeral and we see young Damien turn around and smile to the camera...
Visible crew/equipment: When the ambassador and the photographer are in the cemetery getting attacked by the dogs there are men standing behind a tree. I'm assuming they're the trainers - they are located when the photographer is trying to hop the fence. Look in the back right hand corner - there are about two or three men standing there. (01:21:15)
Trivia: The smile that Damien gives at the very end wasn't scripted. Originally, Damien was supposed to "look really mean," but Harvey Stephens couldn't keep a straight face: he started to smile, then laugh. Richard Donner decided that the smile made Damien look even more evil, so it stayed in the movie.