About the sliding glass door photo... I think it was doctored too. The arm is not proportional, among other things already pointed out. It looks hinky, not lifelike. Someone said if you stretch the photo... the one shown in court DID look stretched to me.
If you simply stretch a photo, it will be disproportionate. With PhotoShop you can extract JUST the item you want enlarged, such as a child, a cat, etc. and copy it and paste it into the original. The child (or any selection) will be proportionate to itself, but larger than it actually is. Nothing else in the photo is change sin size or perspective.
In this image, I did a quick and dirty plumping of ICA, and added more hair to her Bump-it. I enlarged her nose a wee bit.
While I know the importance of the door photo is minor, if it carries any weight at all, photos CAN be easily manipulated by the pros. Anyone ever perused the Worth1000 site? Those are the pros!