Other mistake: Honey touches the pink ball and it explodes into a pink puff of smoke. Despite standing in the smoke with Honey, Hiro does not get any of the pink on him, whereas Honey is covered in it.
Other mistake: To save the two from the portal, Baymax overrode his healthcare protocol by removing the chip and placing it in his glove. However, he still asked whether Hiro was satisfied with his care before shutting down.
When Honey meets Hiro, she has earbuds in her ears playing music. She starts talking to Hiro, pulls them out of her ears, and they dangle out of her shirt. The dangling earbuds disappear in the close up shot of her and Hiro.