All the Mario Movie Power-Ups I Could Find
Super Mushroom, Fire Flower, Super Star, Mini Mushroom, Ice Flower, Superleaf, Superbell, 1-Up Mushroom, Boomerang Flower, P-Balloon, Cape Feather, P-Wing, Turnip, Yoshi Egg, Frog Suit, Penguin Suit, Drill Mushroom, Cloud Flower, Blimp Berry, Red Star, Double Cherries, Propeller Suit, Poison Mushroom, DK Hammer, Cannon Box.
This list does not include Mario Kart items like shells, bananas, coins or Bullet Bills.
Items like the Double Cherries and the Propeller Mushroom are implied to exist, despite not appearing phyically yet.
I know the Turnip is technically not a real power up, but I included it because I think it fits right in well.
Some items like the Super Pickaxe and the Super Hammer do appear as regular tools, but until I see a version of these tools with eyes, I personally don't count them. Oh, and I haven't seen Mario use a Super Hammer to transform himself into Builder Mario yet.
"That picture of the 1-Up Mushroom was only in a piece of promotional material! It didn't appear in the actual movie!". Yes, but a 2D render of it did appear on the slot machines in Wart's casino in Galaxy, so either way, it counts.
Anything I missed?