As the countdown timer goes to 60 seconds before the White House is destroyed, the player will enter a room that has the stairs that will lead to the next floor. If the player turns left and looks on a wall, he can see a stenciled graffiti of a nuclear mushroom cloud with the words "Death to USA" on it.
If the player does not go to the roof of the White House but instead goes outside and waits for the time to run out, the player will not see the jets arrive to bomb the area, but bombs will nevertheless detonate, killing the player.
There is also a book on the President's desk about the Dutch painter Gerard van Honthorst who, somewhat ironically, is famous for his nighttime candlelit paintings.
In the Spanish version of the game, there's no reference to the Hammerdown protocol. Instead of saying "Hammerdown is in effect", the transmission says "Destruyan la zona" which means "Destroy the zone".
Even when there's no timer appearing on the screen towards the end of the level, the player must get to the roof within two minutes (at lower difficulties).
The flare is scripted to force one's view upwards around the time the fighter flies overhead, as long as the player pops it soon after the prompt shows up. If one pops the flare after the fighter passes, the player will see an empty sky.
For a very brief moment it is possible to see "Tactical Insertion" onscreen as the flare pops.
When dropping the flares, they disappear as soon as they hit the ground. However, the AI soldiers' flares stay on the ground.
The music that plays while attempting to retake the White House is also the Army Rangers defeat theme, and the music that plays while the two minute countdown to Hammerdown protocol is the Rangers' victory theme.
When the player uses the flares and backs up to pick up a gun, an error message will pop up.
The "Hammerdown Protocol" is a reference to the same operation to flatten New York City in the 2008 monster movie Cloverfield.
In the room, where Foley kicks in the door in order to get on the roof, there is a Throwing Knife stuck into a table, but the player cannot use it.