I'm stupidly awake really really late, and I just finished watching Part I.
One of the biggest things that bothered was right at the end: the escape from the Phantom Zone.
Here is a quick and dirty fix for you to consider. Really all I did was bleed the black so Zod and the gang aren't wearing light-up gray clothing.
The scene IS darker, but it's in SPACE so I think it works. It'd work better balanced on a per scene basis (I just raised the black by 10 using the Levels filter for the entire clip). Some segments could use more, some less.
http://www.mediafire.com/?gtymynjynjy