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Super Mario Galaxy contains zones called "NoSleepAreas", placed wherever it would be inappropriate for Mario to fall asleep when idling, such as in boss battles. However, no such zone exists in front of Luigi's prison, allowing Mario to sleep while Luigi is pleading him for help.
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In Super Mario 64, there is a specific spot near the top of Tall, Tall Mountain where failing to grab a ledge will result in Mario comically falling down the entirety of the mountain while hitting every ledge on the way down.
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Normally, hitting characters with Star Bits in Super Mario Galaxy will briefly disorient them, after which they quickly return to normal. However, hitting Banktoad in the purple coin mission of Dusty Dune Galaxy will instead make him sad indefinitely, never recovering.