I believe it's mainly due to the LOD settings, they should improve when closer or with a bit of engine.ini tweaking. However, some of the houses look like they are missing textures completely, being grey instead, would need to see a reference image to see if this is actually accurate. Wish was more graffiti on the walls also! But yea it was very noticeable, as was the fact the British Transport Police building is missing completely, with Matt saying that's what's on the route now is what's being released. Wonder if this is because of a licensing issue.
Yeah it does look like those houses have a missing texture of some form, or it's not loaded in. I wonder if it's perhaps part of some optimisation too?
Been provided with some more older reference images from discord also and it does appear to be reasonably accurate, things may have changed slightly since though.
