Okay people point out slipups like this alot and their good ones and other people always say 'he's a fairy' or 'use your imagination'. People, that's not he point. You can explain away anything if you try hard enough. The point is the people who made the show weren't paying attention and made a mistake. Good slipup, good job =)
Actually, no. It was a magical photocopy machine (as said in the episode). If it can copy a picture of an action figure into a fully-3D, living person, it can copy Cosmo's front instead of his back.
-IMP ;) :)