I found a Glitch involving Book and Quil and Maps in 15w32c.
The first one, the Map one, is that when you hold a map in your Secondary Hand and move around, trying to put new areas on the Map, it won't Map it when it's in your Second Hand. Mapping areas works in the Main Hand, but not in the Second Hand.

The Book and Quill one, is that with a Book and Quill in your Second Hand,
even if you write something new in it, when you press "Done" (not "Sign",), it
will not save what you wrote, I've only tested this with Books that already have stuff written in them. Writing in Books works fine in the Main Hand, but not in the Second Hand.

The World was still saved just fine, but it just freezes up when I clicked Save And Quit sometimes.
It doesn't show a "Not responding" error in the Force-Quit Menu, and it's
not just taking a long time to save, because it normally only takes a few
seconds to Quit, even with LAN Opened.

Oh, and if you keep holding the "Use Item" button with Food in your hand while looking at nothing, and your hunger bar is full, you'll just keep flapping the Food around, as if switching items really quickly.

Video of 3, Showing how excaltly to do them:
It'd be helpful to see the video.
https://www.youtube.com/watch?v=tBQ-E0dCEbw&feature=youtu.be
Sorry if these were all fixed in the 33B version, just realized it came out.

The version thing wouldn't let me put in 15w32c so I put 15w33a, sorry.