Nuketown's Population Sign Actually Counts You
That faded 'Welcome to Nuketown' billboard isn't just set dressing. The population number on it genuinely changes to match how many players are currently in your match. It's such a tiny detail most people never look up long enough to notice, but Treyarch carried the idea forward, giving it an actual gameplay job as a kill counter in the Black Ops II zombies version of the map.
