There's no reason for the Fortress anymore - his father is gone. The Arctic Police scene *does* contain one small plothole(?) - Lex menitons "Smallville," which he would not know about in the film universe as he doesn't know Superman is Clark Kent. But that can be cut. And I dunno of the condition, I wasn't paying a hell of a lot of attention when I saw it.
There's also an alternate getaway scene that's less campy than the balloon one, but I like the balloon scene, personally.