GH
I remember when Ron Carlivati was there they were rumors that he wanted to bring Serena back played by Carly Schroeder and Christina Baldwin back as well. Also, let's not forger the patient that Kevin had to rush back to Seattle to treat that mysterious patient. I heard a rumor it was supposed to be Christina, but it was dropped.
The teen quad of Molly/TJ/Rafe/Taylor ended quickly than anticipated. We had a forgettable recast Taylor and it seemed they were finally mentioning Rafe being a Barrington which was dropped when he was killed off too.
Let's not forget about Guza forgoing the initial Valentin Cassadine played by Matt Borlenghi for James Franco. And I don't know if it is true, but he was supposed to have a daughter named Mischa who was going to be paired up with Michael at the time too.
OLTL
Wasn't Nora originally supposed to be the one who killed Sarah Gordon? And they were going to use the excuse of those migraines she used to have.
Tina and CJ was going to return in 2003 until it was scrapped.