Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

 To hide the back shot, which was the first shot and occurred very early, I'm sure they removed the exact frame or frames of it. Here he is in 180, and clearly he wasn't hit yet, and the image is relatively sharp, It isn't great, but you can see how much better it is than 194 which is very blurry. And it stays blurry until he disappears behind the scene. They also put his hand over his face to cover up his distraught look from being shot, as you can see in 206. Those are the main things they did to hide the fact that JFK was shot in the back high on the hill.