Bunny is correct that this is pretty much a non-issue. First of all, you did initially say that you haven't noticed it right away while watching. Most likely many people were just the same. The finger went by unnoticed by many, unlike the wardrobe malfunction Janet Jackson had. That was so noticeable, it was the most TiVo'd moment in TV history. True story bro.

If anything, I'm sure MIA may get fined for this. Anything else? Just leave it alone. Who cares.