Man, that's just brilliant! Great game, 61 Nazis out of 61!
Is there a sneaky Nazi somewhere? I've done it twice with 60 of 61, on second one I was trying to find and still failed. :-) Maybe a table o' Nazi locations
There's a level where you can go up almost from the beggining but it is not required. That's the most hidden nazi I can think of.
To be honest, I didn't even try to find all the Nazis, I just played the game once )