** Bowser's first and second battle themes sound similar to [[StarWars Across the Stars]]. [[LoveMakesYouEvil He's in love with Peach.]]
** Also in the [[spoiler: S World]] there's the Toadships. The green one tells you to "go, go!" The red one tells you "slow, slow!" And the yellow tells you to stay in control. Traffic lights much?
** The game starts with the Star Festival, just like ''VideoGame/SuperMarioGalaxy'', even though that only happens every hundred years. Mario meets the Lumas and the other races of the universe for apparently the first time, even though he met them already. The Toad Brigade forms again. And at the end of the game, [[spoiler:Mario doesn't seem to remember Rosalina, although she remembers him.]] Then you remember how the first game ended: [[spoiler:The universe was destroyed and reborn. This game is the events of ''VideoGame/SuperMarioGalaxy'' happening again in the new universe.]]
-->'''[[spoiler:Rosalina]]:''' [[spoiler:When stars die, they turn to stardust and scatter across the cosmos. Eventually, that stardust reforms to create a new star . . . and so the cycle of life continues. But the cycle never repeats itself in quite the same way . . . So . . . you'll see.]]
* World 2's Solar System: a yellow Sun orbited by a rocky gray planet, a molten orange planet, a watery blue planet, a rocky red planet, a swirly giant planet, a planet with rings, a green ringed planet spinning on its side, and a swirly blue planet.
** In the Spin Dig Galaxy, you get the spin drill power for the first time, allowing you to tunnel through dirt and reach places you couldn't normally. At the start of this galaxy, you use this power to get to Lumas that have put themselves in ridiculously high up places. They all express amazement that you were able to reach them at all... then proceed to help you on your journey, as they were waiting there ''specifically to meet up with you''. So you are trying to help Mario by hiding where you think he won't be able to find you...?
** After all these years of [[PowerUpMount safely carrying Mario to his destination,]] [[HeroicSacrifice and protecting him from many enemy attacks,]] why did Yoshi suddenly [[BadassDecay become unable to protect Mario from a tackle by a mere Goomba/Koopa Troopa in this game?]] [[note]](See Power-Up mount in the main page.)[[/note]]