User blog comment:ChishioKunrin/What is this in Oobleck's glasses?/@comment-5041507-20141013091202

Or, you know, it could just as easily be the reflection of his hair, or a smudge in the glass. There have been some pretty impressive details in the animation in the past. But I would honestly be completely astonished if someone took the time out of their hectic Volume 1 schedule to plant an exceedingly vague clue as to the future of the series in a place that's probably only visible for a few seconds, and takes up maybe a percent or two of the screen. I could be wrong though.