Apart from the pointless enlargement of those low res images, there are also differences in geometry, and the location is actually not structured in the same way: the area shown in the original footage has a source of light that's positioned in the ground area on the left, while in the retail game that section's geography is different, there's no flames and fire lizards on the ground level so they don't cast any light. Thus, the comparison is pointless. A fairer comparison is what you get when you take a few steps back in the retail game and see this:
Sorry for the shitty quality, I had to take a photo with the iPhone (there's in fact some processing on the image related to the camera app), but as you can see the point is the same as the gif I reposted: with simple processing you can acquire a similar result to the original footage, there's the same number of light sources and cast shadows.