Also, I'm not sure SPAN is a requirement for the .active element in a .breadcrumb, but your .breadcrumb-arrow requires one.

I think your constructive criticism has more chance of being heard at the github repo:

https://github.com/bootflat/bootflat.github.io

I toyed with the idea of logging these as issues, but thought they might not quite qualify, and assumed the author would be reading this thread. Maybe I'll go log them there after all ...