I can’t remember the details on the dress now because it was several years ago. When I tried doing a Google search just now there was nothing unusual coming up. It wasn’t the color vs black and white however. At one time there were various wedding photos of the two of them from different sources and she was wearing different dresses. I was not sure what it meant at the time and still don’t know.
As far as the other photos... clarity and detail has nothing to do with the weird hand placement where he is between his grandparents. The photo has been altered... who knows why or if there is any significance. It is just one more weird thing. The same goes for some of the other photos.
Here's the dress looking blue:
And here it's looking white:
I'd venture to say that it's the same dress but that blue veil that makes it look blue in one picture.
The wedding, though, would have had at least a few guests. It would be hard to fake it entirely -- cousins coming from Kenya or wherever and all the rest.
I suppose it would be easier to fake those childhood pictures. Maybe, if he never met his father, I guess you could fake a picture of them meeting. But if young Barry ever lived with his mother and grandfather it ought to have been possible to get a picture of them together with him without cropping somebody out of it, so I'm skeptical of the "Frank Marshall Davis's arm" theory.