Super Mario World easter egg in Paper Mario

[Hypercat-Z]

In Koopa Village there is a Koopa that has the inner of his house painted like a beach.
If you switch his radio to Oldies Goldies Station you can hear a familiar melody: It's the roll credit music of Super Mario World.

[SERIOUSLY THOUGH]

I think it's to be expected from a radio labelled "Golden Oldies", otherwise it wouldn't make sense.