- If you look at the map of Sector 2, you'll notice that the tunnels spell out the number 1337.
- When the "Destroyed Junction" level is overrun, the player will meet a scientist, who says: "I'm knee-deep in the dead". This is a reference to the first episode of the original DOOM called "Knee-Deep in the Dead".
Contributed by Medicine Man (367) on Dec 06, 2009. [revised by : Patrick Bregger (98879)]. -- edit trivia