There are many such pits on the surface of Comet 67P/C-G, but they're not due to external impacts.

Rather, they're akin to sinkholes, where volatile material inside the comet, close to the dusty surface is heated & escapes into space, leaving a large void underneath which can then collapse.

https://sci.esa.int/web/rosetta/-/56121-comet-pit-formation

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The pits were found to be active, with jets of material coming out of them.

https://www.esa.int/Science_Exploration/Space_Science/Rosetta/Comet_sinkholes_generate_jets

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And the interiors of some of the pits were seen to have a peculiar semi-regular texture, with lumps & bumps about 3 metres in size.

Similar structures were found in exposed locations elsewhere on the comet & were christened "goosebumps".

The theory was that these were perhaps the characteristic-sized primordial lumps of material that agglomerated to form the comet in the first place, billions of years ago.

https://sci.esa.int/web/rosetta/-/55305-comet-goosebumps

https://sci.esa.int/web/rosetta/-/55295-getting-to-know-rosetta-s-comet

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However, later work looking at the wider array of structures & fractures on the network emphasised the importance of thermal processing on material with water in it, as Comet 67P/C-G has plenty of.

In this model, a kind of freeze-thaw [edit: badly worded: a thermal expansion & contraction of a solid – no liquid phase] cycle takes place, causing material to crack & fracture on characteristic length scales.

Similar structures are well-known on Earth & Mars.

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015GL064500

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Work was done by Atree et al. a couple of years after the Rosetta mission ended on figuring out how this thermal fracturing process would work in detail on comets like 67P/C-G.

https://www.aanda.org/articles/aa/full_html/2018/02/aa31937-17/aa31937-17.html

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And a full observational paper was written around the same time by Auger et al., titled:

"Meter-scale thermal contraction crack polygons on the nucleus of comet 67P/Churyumov-Gerasimenko"

https://www.sciencedirect.com/science/article/abs/pii/S0019103516300410

Unfortunately this is behind a paywall at Icarus (boo!), so you likely won't be able to read it, although you can get an impression of the graphics here:

https://ui.adsabs.harvard.edu/abs/2018Icar..301..173A/graphics

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So, once a sinkhole forms on a comet, like this one in the Seth region near the neck between the two lobes, the exposed interior material gets processed by sunlight & forms this characteristic scale "crazy paving".

Later, like the rest of the comet, it gets covered in dust as material is lifted off the comet, the gases escape, & some of the dust falls back down.

This cycle repeats each time the comet gets near the sun, changing the colour of the surface.

https://www.esa.int/Science_Exploration/Space_Science/Rosetta/The_colour-changing_comet

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The Filacchione et al. paper on the way that Comet 67P/C-G changes its colour during its orbit & periodic journeys into the inner solar system can be found here, but is also paywalled, unfortunately:

https://www.nature.com/articles/s41586-020-1960-2

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Back to the pits & the dragon scales or "thermal contraction polygons", I'm not aware of an image which shows them quite as clearly as the one at the end of that movie sequence.

It was taken by the OSIRIS narrow-angle camera at just 6.3km distance, resulting in a resolution of about 12 centimetres per pixel, giving a nice view of the 3 metre-sized scales.

For reference, the original image name is:
N20160522T221253020ID4FF22

& the wide-field one is:
W20160522T221252757ID4FF12

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