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fkwYou must be able to compare the photos, the fakes have been cropped a bit on one or more sides and the font on the caption is different, especially the card number. There are also back variations (Cleveland, SF, blank) and tint variations (Sepia or B&W).
PSA and SGC have trouble with this issue as well.
Along with the Fro-Joy cards the Geo Ruth Candy Cards are not the easiest to tell the fakes from the authentic cards.
PS Many of the wax Candy Wrappers floating around are fake too. The main way to tell is the contrast differences in the color of the Ruth portrait.
here are 2 of the Sepia SF variation cards...


Here is a picture I made a while back showing some of the differences...