Here's what I noticed.
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-Opening shots of the shuttlecraft and it being enveloped by the Companion. The new CGI Companion as seen in space looks a lot like the original 1967 opticals, but for some reason the new cloud has a "semicolon" or "apostrophe" shape with defined edges that's quite cheesy looking and startling. It looks really phony and not as textured or three-dimensional as the original optical, which is rare for a Remastered change. Chalk this one up as one of the rare instances when the original opticals from the late '60s were MUCH better. There was no excuse for the new Companion to look this hurried, rushed and bad. It was like something out of a cartoon.
-Now when the shuttle is on Gamma Canaris and the camera pans across the landscape, you can see more of the purplish sky with faint clouds moving and drifting. It looks more expansive and wide. Also, when Cochrane first spots the Enterprise officers, shouts and runs in their direction there's a new sky superimposed over him as he jogs in the direction of the shuttle instead of the old piece of fake-rock set and soundstage-looking backdrop.
-The new Gamma Canaris looks really nice, and the rim of the planetoid has the same purplish tinge that the sky as seen on the surface does.