I haven't seen the full episode yet, but the best thing I've seen in the remastered The Cage is the opening bridge zoom-in. It is, as mentioned, almost seamless, and if I wasn't such a special effects nut, I'd be able to switch off my analyzing brain and see it only as a very neat scene-setter; but there is something about it that makes me want to dissect it, and I haven't seen revealed the closely-kept secrets of how this particular shot was done.
Check it out (1 minute in):
http://www.youtube.com/watch?v=qmEuXsa4z_Q
And the original (skip to the end):
http://www.youtube.com/watch?v=cwNQ6agp6Ig
There seems to be far too much new footage there. For starters, you can see more of the bridge for a longer period of time, but perhaps they simply had the uncropped original film reel to work from there, and then added a bit of CG to the surrounding areas. Secondly, the angle in which the camera approaches changes, from a higher view to a lower one, whereas in the original, it's simply straight-on. I can't work out how that was done, not without extensive rotoscoping and background replacement. One thing that is quite obvious is the slightly wonky-looking "CGI MAN" in the background. I think he's used as a diversion from the fact that no-one else on the bridge is moving, until the shot finishes. Interestingly, the original also has a man in the background, although he approaches from a different angle.
Perhaps the entire bridge was made modeled in 3D, and they dropped the film-stock elements over the top, and then transitioned from one to the other. I think that's the most likely. It's the only way you could get that viewing angle from the original, but it's quite impressive given how accurate the CGI version is, given how smoothly it goes from one to the other, although you can see it if you're really looking for it. I love the little warp of the glass as the camera 'passes through it'. I bet this was lots of fun to do!