I don't get it. Was the fact that he played hangman for a bit his mistake? Otherwise it's hard to tell what's going on because the math is the same color as his face. =/
once again "Have you ever had one of those math/physics tests where you do everything right but at the very end make a stupid mistake?" You might want to brush up on your basic physic theories there because at the very end the c is cubed whereas most of us all know it should be squared.
Yes, I realize that it should be squared. However, I am not familiar with all else that is going on, and therefore I cannot conclude that the last step is the mistake because it could have very well been the first. It looks like there are equations overlapping his face and so you cannot even see them. It's more confusing than you think.
Oh, I missed the "end" part. Please pardon my blindness. Well, I would still suggest making that step stand out a little more, at least... to emphasize the mistake. And possibly illustrate that it's a mistake on Einstein or something. ;)
I could try and maybe add a different shade outline to the e=mc cubed, and maybe underline it a bit, I don't want to make it obvious, I still want it to be a "stupid mistake" the same kind that people make all the time on tests.
Einstein didn't just come up with the theory of relativity on his first try, and consider he's the epitome of genius I think he's the best option for this idea of a stupid mistake.
It's true that he's the epitome of genius in mathematical terms, but that means you need a lot of writing on the shirt (a turn off to a lot of voters).
Why not deal with artistic genius instead? What if DaVinci screwed up on the face of the Mona Lisa, and made one of her eyes picasso-esque instead? (I'm not saying you have to do this or anything, I'm just trying to show you as many options as possible for approaching this- the math angle might not be quite right for this site).
Oh! I have an idea! Make the letter black and but them BEHIND Einstien! Make him the foreground, and the equations the background! That SHOULD make a huge diffrence.