Between the two maps, the things to notice are that some of the streets change from horizontal to vertical; some streets that run North-South in real life run East-West on one of the maps, or vice-versa; and the compass rose on the second map is rotated 90 degrees counter-clockwise. Really the only take-away is "things are rotated".
The page of equations also has a plentitude of red-herrings, but it is much easier to figure out that there is a one-to-one correspondence between equations and words in the fill-in-the-blank. Also, for each equation, the subscripts match exactly the positions of the fill-in-the-blank that have missing letters.
Applying the "things are rotated" mantra to the equations, we find that if we rotate the subscripted letters 90 degrees, they become different letters:
For letters like E, L, and and C, both clockwise and counter-clockwise rotations produced valid letters. However, after trying both directions, it is not too difficult to determine which letters make sense in context. Also, anyone who spent any time with Eric Chase (or has seen Jimmy on South Park) would know that the phrase is not "Mom, what a terrific audience".
The answer, in fact, is "Wow, what a terrific audience."
We mentioned at the start of the game that the "analyze" command might be necessary for interpreting cryptic code phrases in clue solutions. Typing "analyze wow what a terrific audience" into the Networking Toolkit provides the next destination:
Evidence Analysis System
Before he went underground, Dr. Dement was last seen on the roof
of the Marin County Civic Center.