If the player dies early enough to restart at the elevator, Allen will briefly hold his M240 with one hand up in the air, and then puts it down again.
An animation inside the elevator can't be seen because of the mission's title screen. In this animation, Makarov grabs Kiril by his throat and pushes him against the side of the elevator before saying "S nami bog", which translates to "God is with us" in English. This can be seen in "Museum".
While the screen is black, it is possible to move forward. If the player does so, they can get out of the elevator doors before the other terrorists and see that all the civilians are standing still. Advancing forward, it is possible to see some civilians running where the people surrender, even though the attack hasn't even started. Eventually, the frozen people will move nonchalantly and won't even notice the player until the attack starts.
If the player looks closely at where all the buttons are inside the elevator, they will see "IW" engraved around the lower left side of the buttons.
At the end of the level the player can shoot the ambulance's doors and kill Anatoly inside. His body will drop out of the ambulance, and Makarov and Viktor will both turn on the player.
If the player uses noclip just before they get shot by Makarov, the player can see a seventh terrorist in the driver's seat. Upon closer inspection, one will notice that his name is actually a random Task Force 141 callsign.
Even if the player runs back through the hallway out of Makarov's line of sight, he will still pull out his M9 and kill the player.
When the ambulance drives off, it will go right through the approaching police car.
When walking to the ambulance, the same music that is played at the end of "Endgame" will be played.
One of the newspaper clippings in Makarov's safehouse says that the Russian government accepted that Makarov carried out the attack, but said that the U.S had armed and supplied Makarov. Thus, the major point in the whole incident is not whether Makarov has been involved in the attack, but whether the U.S. had been supporting it.
A total of 243 people were killed during the Zakhaev International Airport massacre.
Out of the several stores on the top floor, there is an alcohol store filled with whiskey. If the player goes to the front counter of this store, there will be two game cases with Cpt. Price on the front cover and the same back cover as the real-life Call of Duty 4 case.
In the same store mentioned above, there is a poster advertising whiskey. The catchphrase for the whiskey is "It goes down deep and hard," A reference to the last level in Call of Duty 4.
This level has the most teddy bears of all the levels. Two are found near wounded or dead Russians and several are located throughout the shop near the elevators. Large, medium, and small teddy bears are everywhere. Also, there is a small teddy bear on the left side of the shop where the small ones can be shot to pieces. On the very far left down shelf there is a teddy bear that is a dark brown. That is the only different color in the entire game, although when shot, the color will change and disappear.
If the player shoots the terrorists with a single bullet in a non-lethal spot after killing some civilian, Makarov will warn the player to check his fire. Any more damage will cause them to turn on the player.
This level does not need to be completed for the 100% campaign completion.
During the fight with the FSB, the player can hear Makarov's men exchange battle chatter in notably forced American accents.
In the game's internal files, there are unused audio clips. In this clip Makarov can be heard saying: "You've served me well this far. Don't give me a reason to doubt you.", "Well done. I knew you wouldn't let me down." and "Open Fire! That's an Order!"
The player can make soda cans pop out of the vending machines by pressing the "use" button on them.
According to "_introscreen.gsc" it was supposed to take place in Terminal 3, Domodedovo Int'l Airport Moscow, Russia, but it was changed to Zakhaev International Airport probably to avoid causing more controversy by using a real location.