Trivia: In the scene where Hiro and Baymax go to the police station after jumping out of the window, in the depot behind the guard are a lot of wanted signs. Pause the movie and you'll see one of the posters is Prince Hans from Frozen, by the same creators who made Big Hero 6. Hans can be seen again as a statue when Baymax destroys it.
Trivia: The number A113 appears in the trailer when Hiro helps Baymax puts on his suit - a frequent in-joke in Pixar and other animated movies, referencing the classroom used by graphic design and character animation students from California Institute of the Arts.
Trivia: The name Yokai is never spoken in the film. Instead, he is referred to as "Guy in the Kabuki Mask", "Masked Man" or "Man in the Mask."
Trivia: When Baymax is inside Hiro's room for the first time, Hiro falls backwards, and multiple objects begin to fall off the shelf. The first thing that falls onto Hiro's head is a baby Cy-bug from the Disney movie, Wreck-it-Ralph. Also, a doll of Wreck-it-Ralph is seen falling off the shelf.
Trivia: In the original comics that serve as the basis for the film, Hiro is a child prodigy who fights to save his adoptive mother the Everwraith, an entity made from the souls of those killed in the atomic bomb attacks on Hiroshima and Nagasaki. Naturally, this was a little too edgy for Disney.