As for AFA I have a very good Canadian friend that sent in his toy fair Vader to AFA. He's an excellent collector and a very big vintage carded collector as well so he's quite aware of grading and quality factors for cards, bubbles, etc. He was pretty convinced he sent in something that should come back as AFA90 and it came back AFA75. He is absolutely convinced that AFA switched out his Vader for another. Now, it's completely and utterly anecdotal and there is precisely zero proof behind the story. But I know the guy, he's been collecting since he was a kid and that's when the movies first came out. He's a knowledgeable authority IMO and he thinks he was screwed. I'm betting he was right.
I have a similar story, but not about Star Wars. My wife and I built her engagement ring together (we're such a modern couple). We looked at stones and were sold one that was a little smaller, but with excellent clarity, and the only occlusion was deep in the stone near the base of it, and you really need a loop to see it.
Now, I stare at pixels all day long looking for any little **** up in images, I'm observant, and I'm quick to catch things like this. I saw the occlusion clear as day, but could only see it under the loop.
So we pick that one, and the ring gets made, we get married and live happily ever after. Then one day my wife notices a pretty large occlusion, just beneath the surface of the diamond. Everything else is as described - clarity, cut, size... BUT, there is absolutely no way in hell I missed this occlusion that you can see with the naked eye right on the top of the stone. It's in the gem report, and I bought it... but I am 110% convinced that they did not put the stone that we picked into the ring that we designed and bought.