Book Blooper - Tales from the Clerks

For my fiance's birthday, I pre-ordered Tales from the Clerks by Kevin Smith. He's a huge Kevin Smith fan, and blah, blah, blah... It arrived yesterday from Amazon. Upon taking it out of the box, I noticed a mistake on the back cover.

I circled the error. Two people are listed on the credits twice. Since I'm not a big Kevin Smith fan, I asked my fiance if there was any possibility it was done on purpose. He didn't think so. I can't figure out why they'd do it either.

Maybe they'll fix it for later editions.