Make King Koopa and all the people in “Dinohattan” look like they do in the games: highly evolved dinosaurs would look like Koopa Troopas.
Instead of it being the Mushroom Kingdom, call it SarasaLand, (which is were Daisy is from in the games anyway)
Make Lena into Wendy Koopa, Spike into Lemmy Koopa, and have Iggy, Wendy, and Lemmy be referred to as Koopa’s Kids.
Make all the “Goombas” either Super Big Goombas, Buzzy Beetles, and/or Dry Bones
Change Big Bertha into a BoomBoom (but still technically be a big black woman)
Those jumpy shoes are now Kuribo’s Boots.
Name Mario’s girlfriend Pauline.
Have baby Daisy not come out of an egg, but out of a ?Block at the beginning.
Make Scapelli into Foreman Spike from Wrecking Crew, with his cronies being Wario and Waluigi.
Have Scapelli turn into Donkey Kong when hit with the de-evo ray.
Koopa turns into Giga Bowser when he’s hit by the de-evo ray
Yoshi is baby sized
Flamethrowers are Fire Flowers
Have Toad (yeah, he was in the movie) look like Toad