I Pulled An Error And Didn’t Even Notice

Going through some of my base cards, I found out that I pulled an “error” card yesturday.  The Brett Favre 2008 Donruss Gridiron Gear base card #67 is considered and “error” because card #67 on the checklist is Kellen Clemens and not Favre.  In fact, when you look at the checklist Favre isn’t on the commons list at all.  What are the odds?