The design of the Tower of Babel in the game's cinematic intro features a brief glimpse of a section that appears to be modeled after the front of Sleeping Beauty Castle at Disneyland in California.
Contributed by MehDeletingLater
The Science Adviser's appearance is based on Civilization creator Sid Meier.
Contributed by Kitsune Hawk
If you change the date on your PC to January 8th (Elvis's birthday) and start a Regicide, Mass Regicide, or Capture the Flag/Princess game, the flag units will turn into Elvis.
Contributed by Sengir