I am not too against fanon - considering that their will likely only be one installment of Pnauts, people use fanon as a means to flesh out the universe, and some I will agree with even. But that fanon that has no basis and has data proving otherwise is what's grating. More fanon:
Pnauts HQ having dorms: Doesn't make sense. Other govvie workers live in their own houses. Why would the Pnauts be any different?
Psychonauts Academy: self explanatory
Some stuff I'm surprised isn't fanon yet:
-Milla wearing nothing but dresses