Someone folded their vote the wrong way before putting it into the urn, making it possible for the other contestants to see it. I can't tell who the vote is for, but I guess there's at least the chance that this is why Natalie suddenly wanted Jon to play his Idol (though it actually looks like an "H" that can be seen on the vote, meaning a Keith-vote, and if I had to guess I'd say it's actually Natalie's vote that can be seen. Just thought it was worth noting).
If you watch the video you can actually clearly see Alec stopping for a second before putting the lid on the urn and looking at the vote lol.
I wonder what the producers thought when they took the votes out of the urn?