Yes as stated by others it does come with the attachment as shown in the product picture but it is merely a snap on sort of light sheild. IMHO not very useful attachment for a small camera like this as it makes the camera look bulky. It works without it. It is not a wide angle attachment as one might think. It is just a plastic snap-on more or less like "flower" type lens hood found in DSLRs to avoid flare when stray light strikes the front element from bright light sources.
No it doesn't but you can plug in a external mic.
if I remember correctly the 5.1 audio does work with a external.
either way the internal mic was pretty well because most of the features work
with it like the wind reduction.