Three codes were hidden in the HTML source of the DREAMS AND NIGHTMARES post on the Investigate Ingress blog.

[1] r5ciu6ctt2yo29ex

[2] abgc92aervit52emu7

[3] 039400752551148890

Code #1

Observations

16 characters with the right amount of numbers for a valid passcode

Code #2

Observations

18 characters with the right amount of numbers for a valid passcode

Code #3

Observations

Not an easy one, but z=a=0 will help