Fourth, sometimes being in control of an overall situation entails choosing to surrender that control at certain moments, with the confidence that you've arranged things in such a way that it will turn out all right. Like when you jump out of a plane after carefully checking your parachute. In this case, Superman was Lois's parachute, and she was confident that she'd made the checks correctly. Which, let's remember, she had. This version of Lois Lane figured out that Clark was Superman just by looking beyond the glasses, and that alone makes her smarter and more in control than just about any other Lois Lane.
Well if it truly IS as obvious to her as it is to us-- because duh, the Clark disguise isn't the most convincing one ever and it's obviously Superman under there-- then I have no problem with her jumping out the window and proving her point.
But if that's the case, they is should have been JUST as freakin obvious to her during the FIRST movie. The first time Superman made his appearance, she should have been like "Dude, you're that nerdy Clark guy we just hired and who I was talking shit to all day!!" Or at the very least the next time she saw Clark again she should have noticed it was clearly the same guy (and don't try to tell me she was too emotional or distracted at the time to notice; I'm not buying that for a second).
The fact she doesn't makes me think she really only has a strong suspicion
it's him (even after drawing a suit and tie on his picture), in which case it really IS a stupid and idiotic thing to jump out the window.
It's still a fun scene of course, but ultimately I think I prefer the way Lester did it.