Actually that's not a failure. I was wondering if that was in there actually. That is actually an incredibly cool thing. Why? Try looking at the real Lincoln Memorial. That word is actually mispelled in real life. Seriously, not joking in the slightest. I actually asked a park ranger about it (they're stationed at all monuments) and he told me about how they don't know for sure but they think the guy doing the stone carving was tired and made a mistake. They've "fixed it", but its stone and you can still see the screw up.
Epic fail on your part for being ignorant though man. LOL, nice job.