Comet Chury's jets - before, during, after

emission of a jet on comet 67P C-G imaged on Nov 30, 2014

Comparison of the neck area of comet 67P C-G on images from ESA's Rosetta blog
Credits: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
here with some contrast processing (HDR) applied

Inset upper left Nov 30, during emission, background Dec 09

The "rilles" which appear to be new are located at the origin of  the jet.
Also the dark "smear" to the left of them seems to be more prominent now.

Comparison of images taken 2014 Nov 30, Oct 02, and Dec 09

Comparison  Nov 30, Oct 02, and Dec 09, 2014

The interpretation by ESA of the Dec 09 Rosetta NAVCAM image is rather cautious.

Follow the discussion started on the UMSF forum
"The latest Navcam blog shows new - or apparently new - features in the neck. Here's a comparison between October and December images (December on the right). I would suggest a close examination of images would probably show more things like this.
Phil"

Take a look at the comparative series by Bill Harris