So what's the big hidden message? The answer lies in the family cat, Mochi. In the scene where Hiro attempts to secretly sneak Baymax past Aunt Cass and back up to his room, there's a frame where we can see a bunch of family photos on the wall. In one of those photo frames, is a picture of Mochi dressed up as Stitch from Lilo & Stitch!
Did you catch this Disney easter egg when you watched the movie? Comment below if you did! If you didn't, did this hidden message surprise you? Let us know!