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

Let's look at the purple thing in a larger context. I think what they were going for was to make it look like the molding of the window, although it's on the wrong side of it. They're not trying to imply that her hand was way outside the car where I put the x below, are they?

And why did they make it purple?

Well that, I think was just a mistake. They got sloppy with the photoshopping. At least, I can't think of any reason why they would have wanted that to be purple.