As OCHawkeye stated, fairly common for the foil to go awry in the stamping process. Obviously, this was a misfed sheet (upside-down), and it shouldn't have gotten put in packs , but it happens - almost every year and in every product. Also, wrong backs, blank backs, blank fronts, and other foil misfirings are all very common printing flaws, however, none of those are catalogued here.
This certainly doesn't mean there isn't a market for these type of errors. I had a wrong back sell on ebay for $1 when I probably wouldn't have been able to get 25 cents for either (or both) of the players on the card. So, market can be there, we just don't catalogue such errors. If it is something you wish to track here, use the Details in your collection (use either Detailed Add when adding, or go back and select Edit Details) and enter something reagrding the printing error in the Comments field.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).