Confused by some lines of a sitcom.
I'm watching a old sitcom called The Golden Girls. There's some lines I can't understand.
When Dorothy met Blanche's father first, she thought he's someone who she hate so she shouted at him. When she knows the truth, she said:"I'm sorry. I hope I didn't offend you."
Blanche‘s father said:"No harm done, darling. Now, I want you to promise me you won't fret none."
Dorothy said:"Well, I would, except I'm not exactly sure what "fret none" is."
What does the "fret none" mean?
When Blanche knew her father’s gonna sing in a club and he want to be a singer, she think it's so ridiculous.
Dorothy said：“Oh, come on, Blanche, you're overreacting! If you're really concerned, why don't you talk to him?”
Blanche said：“You're right. That's what I'm gonna do. I'm sure there's some perfectly logical explanation why my daddy's lost the stuffin' out of his comforter.”
What does the 'lost the stuffin' out of his comforter' mean？