The shoes in episode one are most certainly black shoes - I went back to check just in case - and if the Doctor never switched his shoes back with the ganger, it could very easily be the clone. Still, though, I suspect Steven Moffat isn’t going to make it that simple, because when does he ever make anything that simple. And I’m sure the doctor has more black shoes in a closet somewhere in the TARDIS.
Seriously, this last episode was a mind trip. But I liked having the two Doctors~ It was cute~ They were so pleased with themselves. <3