Basically, there was a Skeleton stuck on the surface, not burning during the daytime. At first, I thought that he would need to be updated like blocks so I hit him one time. He DID take damage, however he did not die nor was I able to hit him further. He also took up space, he wasn't just the model of the Skeleton without a hitbox. Saving and quitting to title then reloading fixed this bug, it seems. Nothing game breaking, but just a tad annoying.
Here is a picture of the Skeleton: http://i.imgur.com/uJy4jjl.jpg
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confirmed the same result 15w43a, will check 15w43b

Reproduced in 15w43b
Actually it stucks at night and is still visible at day. it somehow blocks the way, but skeleton do nothing
p.s. survival (no plugins installed) java 64 (shipped with minecraft)

On a new world?

nope, the world was created 14 October, 2015 (whatever dev version was available at this time). If you wish I can attach save files.

Probably leftovers from before the bug was fixed then.