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Seems there's an unused Star Bit cluster here in Gold Leaf Galaxy... triggers say they're visible by default, but I don't see them in-game. You never get them, either.
I've come to ruin your day: this planet from Super Mario Galaxy is made of wood, not metal.
The timed Ground Pound Switch uses a LOTTA unused texturing. The base for the switch is normally yellow, but when activated, it uses the red bits of a texture with a starburst texture to turn red - but the starburst itself is unused. The ! also has majorly unused red texturing.