I have the PC version, and I don't think there are any more save points. I could be wrong, but I don't think I am.

I don't see a noticable difference with the graphics either. I'm sure they maybe worked out some kinks like they did with the PC FFVII. For example: the W-Item multiplication trick doesn't work on the PC version of FFVII. I wouldn't be surprised if they did something like that for FFVIII's PC release too.