Cap 7 doesn't look bluer to me. It looks brighter. Since they were watching a projection of the replicants dossier, the projector probably gave off a blue hue. When they brightened it up, that showed through just a little. The non-brightened cap is much darker though, with almost a purple tone.

As far as cap 12 goes, they're probably trying to impress on the viewer the feeling of coldness. That is the scene where Roy talks to Chuy in the freezer, so it almost makes sense that it be blue.

It's not like they went through and made white corridors look blue. Overall, I think the reviewer nailed it. The scenes appear to be mostly brightened, which may have had the side effect of bringing out a bluer tone (other than the freezer scene). The unicorn scene looks fantastic!