There are plenty of "mistakes" in evolution, but not in the way you are looking at it, Kevin. Mutations can be detrimental to an individual creature, and those individuals often don't survive to reproduce. Mutations that are beneficial are likely to be passed to the next generation. The evolution of an entire species in a certain direction is not such a mistake, but is a means for the creature to find a niche in which to be successful. An entire species changing to adapt to a completely different environment, like mammals who went back to the sea, is often a response to a changing environment.
I think it's SUPER-neat, even though I obviously couldn't win it anyway!
In Italy, it's Mi-LAN. In Tennessee, it's MY-lan.
In Greece, it's ART-imus. In Kentucky, it's Ar-TEE-mus.
http://www.misscellania.com/miss-cellania/2010/12/7/do-penguins-fly.html