1. We already have a Simpsons thread here
. Multiple threads for the same show are generally discouraged.
2. Those aren't bloopers. A blooper is when someone stuffs up a line or a mistake like that is made - almost impossible in animation.
3. Dude, everyone noticed that first mistake. And as for the second one, since when did brain size equate to intelligence? The "my thumb covered it every time" was already a poor-ass explanation for the crayon in the brain in the first place. I'm surprised you didn't mention the Simpson gene.
4. The Simpsons uses "flexible reality," meaning that various rules of logic and what-not can be changed between episodes - the location of the house, whether or not the show is grounded in plausible reality, etc. Continuity is rarely a big issue on the show, mistakes like these are totally acceptable.
5. Bye bye, thread!