It's more of that I haven't seen enough for me to be convinced that it is fake.
So far we've got a few pixel, color, and font errors. That isn't enough for me, especially since all of these mistakes, if they were photoshopped by the same person, should not have happened, there is no reason you would change the font/color/thickness of something when you already have the template of what it should be. Admittedly, that should also be the case if this is legitimate, as there is no reason a developer would mess up as they should have a template for what this is, unless they added in Little Mac to the tourney mode from an earlier build and forgot to change the font, as he is the only one that stays true to what the Direct's font was. That seems more likely to me then a photoshop error, since I work as a game tester, things like that happen all the time. There are plenty of things like this that the developers forget to change between builds, and since they are such tiny details, they often get overlooked to fix the more serious issues.
Several of the letter fonts are different then what they should be in the direct.