The big one for me is the particular shade of grey they used for the Enterprise's hull color.
Yeah, it looks like the default, flat grey that's found in MS Paint and Photoshop. The ship always looked very white to me in the original FX - and I grew up reading it described as such (and pictured on the covers) in the old novels. Mr. Scott's Guide to the Enterprise
even mentions Starfleet deciding not to add the usual layer of paint to the Enterprise after the TMP refit since it's stark, metallic look was so awe-inspiring.
Fascinating, thank you. So they did go by an old fanzine's speculation - just a different fanzine to the SFOM.