Mei's nightmare was quite the "WTF" moment.
The nightmare sequence right before she transforms into the panda for the first time. Like seriously, what in the heck was that all about?
I wish they would have explained the meaning/symbolism behind it at least a bit more. Because it just felt out of place and was too creepy (for a Pixar movie anyway). Especially the human faces on the flowers, and her boy crush flopping around like a fish. Like, what the fuck? I didn't sign up to watch a David Lynch movie, lol.