References to DICE's past games.

PolishFinnish

The flat panel security chip has 1942 referring to Battlefield 1942.
There was also a audio file called Omnistat Gold #01 which refers to Battlefield: Bad Company

SweptbackFlame

I seen this too. Omnistat Gold audio files are all Bad Company references. And it's absolutely hilarious.

PALADiN

The achievement/trophy "I saw you on the battlefield" is also a reference to Battlefield games. There's also a runner emblem that looks like a dogtag with 1942 on it (referencing BF1942).

Pabst

Mission "Benefactor" is a reference to game "Benefactor" developed by DICE and published in 1994.

Yuki

There are blonde girls who's haircuts look like Celeste from Mirror's Edge, obviously enough.

Imaproshaman

Yuki wrote: »

There are blonde girls who's haircuts look like Celeste from Mirror's Edge, obviously enough.

Although I was running past one of them, and they said something like "I want to leave the city like that Celeste". Which reminded me of the comic. (Which I read the synopsis of on the Wiki.)