It's the way some of the objects look. The clouds and the score are the best indicators of which way he's running, as the lines are trailing towards behind Mario.
Jesus you people suck. Go do a search on those other secret nazi things and tell me that a lot of those weren't edited in. Also, the SS was what it was called when I was learning about WWII and crap like that. It still makes sense if you don't overthink it to death.
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