Yeah, you're wrong. It's a flourish, not an eye. You can see it better in this enhanced image.
It's the same pattern used earlier in the video when introducing the characters.
But you may be on to something regarding this video. At 15:32 minutes into the video I saw something very strange.Here is the original photo. If you look closely, you can see it in the bottom left corner.
Don't see it? It becomes easier to spot once you enhance the video.