So a detail in Super Mario 3D World is Mario is depicted holding is breath. This is a little detail that likely something Mario is doing in all the 2D platformers that don't have an oxygen meter.
#mariolore #supermariobros #mario #supermario #mariocanon #supermario3dworld #marioholdinghisbreath

In Bowser's Fury Mario goes out of his way to help Bowser Jr. return Bowser back to normal, even though he has no obligation to do so. This shows how Mario will choose to help others even if they have wronged him in the past.
#bowsersfury #mariocanon #mariolore #mario

So in Super Mario Odyssey you can find Poochy hiding in several places with a Power Moon, with one of the main ways you can encounter him is via fishing.
#mariolore #supermariobros #mario #supermario #mariocanon #supermariosunshine #poochy #yoshisisland

The Donkey Kong Land Manual on page 16 states Big Ape City aka Big City is the same place Donkey Kong(Crank) used to stomp around. The characters get travel there from the Kong Archipelago by blimp.
#donkeykongland #mariocanon #mariolore #donkeykong #mario #supermario #newdonkcity #bigapecity

According to the Super Mario World Manual, the Sunken Ship in that game is the same Airship from Super Mario Bros. 3.
#mario #supermario #supermarioworld #mariocanon #mariolore #supermariobros3 #bowsersairship

In Super Mario Odyssey's ending Mario comforts Bowser after they both got turned down on their marriage proposals. This shows a side of Mario that not many people talk about with is while he and the Bowser are enemies, he still cares for him.
#supermarioodyssey #mariolore #mariocanon #mario

In Donkey Kong 94, Big City aka the location where Donkey Kong Arcade took place; is revealed to be on the same planet as the Mushroom Kingdom. Something even Miyamoto pointed out in a developer interview.
#donkeykong94 #newdonkcity #mariolore #mariocanon #donkeykong #25m #bigcity