Noteworthy or unusual exemples of the "Grandfather Clause?"
By that i mean funny or strange exemple of things completly out of date or never played straight who are allowed to stay because it's too iconic and/or too ingrained into the franchise DNA.
And there's a lot of these kind of things, like the Scooby Gang outfits, Krusty the Clown show still existing, Pokemon main games always being in two versions, Ace Attorney taking place in California, Princess Peach being kidnapped being played straight (and even then it depend), Martian existing in Doctor Who or DC Comics,...I could go on and on.
Is there exemples of this really sticking out?