I feel like they wanted to use credence in the 1969 episode, were told no, and when they got to undying they were just like "The golly they gonna do, cancel us?"
I've also heard that the rights on music are really nuts, and if you want a big song, it's going to golly your budget.
As to the goodwill thing, I used to be scared when my mom would go back there, like she was stealing or some poo. Turns out that's a gray area of the law.
One neat Spider-Man fanfic he found himself in Gotham and used this gray area of the law to get civilian clothing.
I got this one area of the living room I need to get into, to either discard stuff, or reclaim stuff, and I can't, mom set up planters. Imagine like a standing metal bookcase with no back filled with plants.
She is also eager to get back there.