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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
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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