** Bowser's first and second battle themes sound similar to "[[AwesomeMusic/StarWars Across the Stars]]". [[LoveMakesYouEvil He's in love with Peach.]]
** 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.]]
** [[spoiler:To further support this in later games, think over it; ''VideoGame/LuigisMansion'' has a system where the more money one gathers, the nicer the mansion one getss at the end, and in a ''VideoGame/MarioKart'' released after the first Luigi's Mansion, Luigi's course has a huge mansion -- the one acquired when one gets the most money possible. But in ''VideoGame/LuigisMansionDarkMoon'', he has a normal-sized house from not acquiring that much money in the first. It does first come off as a ContinuitySnarl, but when one remembers, if the universe was reborn and everything happened again albeit a little differently, and Luigi isn't that brave in this game, that's a brilliant ContinuityNod -- if Luigi wasn't as brave in the new universe's ''Luigi's Mansion'', he wouldn't gain that much money! So of course the house would be smaller this time around!]]
* 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.
* Why is Lubba so large and tubby? Well, his color and eyes place him as older than most of the Lumas, though younger than Polari, and he's portrayed as an adult. ''Many stars expand toward the later end of their life cycles'', before imploding at the end.
** 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 PowerUpMount in the main page.)[[/note]]