Lois Lane looks terrible in this...
This is not a bash Margot thread; I actually use to nurse a healthy crush on her, and think she was a very attractive woman back in the day.
But I just watched Superman III regrettably, for the first time in at least 10 years. It was also my wife's first time. She didn't notice anything off until the final minutes of the film, when Lois comes back from vacation. She said "What the hell happened to Lois? She looks so old". And she was right. Kidder was only 33 years old when filming started on part III, but she looks over 40, leathered, and worn down.
Now I know Kidder wasn't leading the cleanest life back then, but still it's startling. She looks ten years younger, and downright beautiful, in a tv movie called "Vanishing Acts" that was released three years AFTER Superman III; look it up on youtube, you'll be floored at how much she looks the same as she did in the original Superman. Hell she looks better in part IV than she does in III.
I'm wondering if this was purposefully done, due to the Salkind's obvious dislike of Kidder after her infamous comments about them to the press. Even in the ending scenes with Lana, Annette O'Toole is well lit with soft, flattering lighting, while Lois' close ups are harsh, and unforgiving. It's like they did everything possible to make her look as used, and chewed out as possible opposite the sweet, lovely Lana Lang.