The shot of Lietuentant Torres getting frozen is different from the original was the only real difference I noticed.
Good catch. Ex-astris-scientia didn't even notice that.
I think you may be the first to point this out (please correct me if I'm wrong). I thought
the wider angle looked a bit odd, because I hadn't remembered seeing the jets of frost moving around at him like that before. The close-up
of Torres was always an optical enlargement of the medium shot (it's about a 220% magnification). That's why the grain looks huge on the close-up. That I did notice, but I hadn't gone back to look at the original SD version until just now, and you're absolutely right. I think they went with the original framing to minimize how bad the close-up looks in HD.