GNUS vs. Gnus
Not really a bug, but:
|In any case, after spending all that energy on coming up with a new
|and spunky name, we decided that the name was _too_ spunky, so we
|renamed it back again to "Gnus". But in mixed case. "Gnus" vs.
|"GNUS". New vs. old.
Now, at least
lisp/menubar-items.el
lisp/simple.el
still carry GNUS ;-)