The victim is being introduced as coming from Hennepin, Minnesota and Hennepin is presented as a town. However Hennepin is in fact a county in Minnesota; Minneapolis is in Hennepin county.
Det. Rollins says she analyzed written materials, ostensibly by two men, and that all of them showed an inclination to British English rather than American English, including the use of the "subjunctive tense." However, the subjunctive is a mood, not a tense (in English, verbs have a tense, an aspect, and a mood) - and anyone who knows what the subjunctive is knows that. In addition, it's highly unlikely that Rollins - a product of 1980s-and-beyond public schools who didn't then major in English at college and train as an editor - would know about the subjunctive. Finally, the subjunctive is not uncommon in American English and would not be considered a signature of a particular writer, as would the use of "towards" rather than "toward" or the use of British spellings rather than American (theatre vs. theater).
Rollins did not have Estelle Robert's permission to enter her son's room, that combined with the fact that his door was closed (violating the plain view doctrine) and they had no probable cause or warrant means everything they found in that room is inadmissible as evidence.
Megan tells Liv that the rapist had a hawk mask, but then Liv says to the others that it was a goat mask.