Fans also noticed that Abby's clothing gives a subtle nod to Pixar's "Monsters Inc.", since the flowers on her purple dungarees resemble the design on Boo's door. So my #TurningRed head canon is ...

Boo is the precocious toddler who inadvertently hitches a ride back to Monstropolis with Sulley one evening in Monsters, Inc. Before he can successfully return her, however, things go awry and ...