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

Here are two examples of a CGI figure that was inserted into a real video.  You may have to hit the Play button twice. 

Now that you've seen that, look again at the video of the roof-jumper. Which is better? I think the two above are much better than the roof-jumper. Really, they did a crappy job with him. And the whole purpose of the black outfit was to make it easy. If they had to juggle colors, it would have been more work. And notice how uniform his coloring his. His clothes, his hat, even the skin of face, it's all the same charcoal color, the lazy bastards. 

https://www.youtube.com/watch?v=fdDtlNf7neI

Look how spindly the jumper's legs are before he descends.

After that, he fills out. Isn't that special? 

In this one below, he is supposedly putting down his rifle. 

Then, as he's falling, his legs become impossibly long. 

The part in which he is running gets really bad. Look how crude that is. 

Also, there is a person walking on the path who walks  behind a tree and then disappears.