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In the map "Showtime", if the player climbs up to a certain broken window and looks through it they can see a poster for Gun 2 on the back wall. This poster is a reference to the 2005 Activision game, "Gun."
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During the campaign mission "All or Nothing", the player must defend an American aircraft carrier from the Federation. Eventually, the player must jump across to a platform aboard a carrier vessel. A short slow-motion segment presents itself where they are preparing to execute Private Ryan. This is a reference to the movie "Saving Private Ryan".
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The second Extinction map, "Nightfall", has an easter egg very similar to the "LOL" easter egg on the first Extinction map, "Point of Contact".
Four of the transformers on the utility poles will spark in a random order, and shooting them in that order will cause the word "ZAP!!!" to appear on the screen. After doing so, every enemy killed within four to five minutes will explode parts of snowmen.
Four of the transformers on the utility poles will spark in a random order, and shooting them in that order will cause the word "ZAP!!!" to appear on the screen. After doing so, every enemy killed within four to five minutes will explode parts of snowmen.
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On the map "Point of Contact" in Extinction mode, shooting the glowing L, then O, and then the L again on the "Gil's Lodge Motel" sign will display the acronym "LOL" on the screen, and cause all aliens killed within the next few minutes to explode into golden martian plushies.
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