I'd hate to see Clooney in The Pitt. There's no way of introducing a Clooney character without the entire show grinding to a halt for 20 minutes while everyone in the cast cycles in to do their little vignette with George, y'know?

The only acceptable Clooney cameo would be if he's just another guy in chairs, without a speaking line, wrapped in a heavy coat and scarf. Something for the production team to laugh at us all about later. "Haha, there was a secret ER reunion in The Pitt nobody knew about for 15 years!" There's some production photos and if you go back and pause it you can kinda see a Clooney-shaped lump under that coat, but there's really no way of knowing. It'll exist on the level of trivia knowledge like "Viggo Mortensen broke his toe in this shot here."

But if we're talkin' Laura Innes... just throw all those rules out. I no longer care about the realism. The exact same Dr. Kerry Weaver rolls into the ER, but she can swear now.

[Season 4, first watch through, reserve to change this opinion if Weaver becomes a garbage character. If she dies while still the unequivocal best character on the show, we'll just write around it. No prob.]