Heather - on King of the Hill, she was on the episode titled "Hank's back", when he hurt his back and couldn't work. She was the voice of the snooty insurance lady (or something like that), who kept trying to prove that his back really wasn't hurt and he was faking it.
As for Mr Brooks, I'm guessing her part really isn't big enough to where her name is going to be mentioned on very many previews. Then, of course, you've got Kevin, Demi & William who are going to get all of the name droppings every time.
And another side note: I like Danielle Panabaker, the one that plays Marg's daughter in the movie. I've been checking out lots of her and her sister, Kay's work. I like Danielle in Shark, which is right on after CSI on thursdays. The girls have said that Danielle is the more quiet of the two. Kay said she is more outgoing and will "try anything at least once". So I wonder which of the two Marg liked working with best! You know Marg - she'd never actually pick between the two. She'd be politcally correct and say she liked both of them equally.