Deliberate mistake: There's no way Lois Lane, a beat reporter for the Daily Planet, could afford living in a penthouse apartment.
Suggested correction: There are plenty of ways for her to afford it. For instance, maybe it belongs to a wealthy relative who lets her stay there when they are out of town. Since any explanation would be irrelevant to the plot, there is no reason for the movie to waste time on it.
Deliberate mistake: Before Superman traps the black missile, its beam is really big and covers half of the lettering on the side. When Superman is behind, the fire is much smaller and the lettering is visible, allowing us to see Superman.
Deliberate mistake: At Lois' penthouse, before Superman says goodbye, the image is sharp and clear. Cuts to a close-up, and then check the next wide angle where he says goodnight and flies away: It's blurry and grainy because it's not live, but a screen with a previously shot scene to allow for the camera to turn left and, in a matter of seconds, no cuts at all, show Superman magically and quickly transformed into Clark Kent.
