Barksdale Air Force Base in Louisiana doubled for Camp Pendleton in many shots. Air Force One carrying President George W. Bush initially landed at Barksdale AFB on Sept. 11, 2001 after the terrorist attacks. The filmmakers have said that they used the aftermath of destruction of the Twin Towers as a reference point for much of the destruction in Los Angeles seen in the film.
TSgt. Santos' (Michelle Rodriguez) military unit exists in real life. The 61st Air Base Wing (61 ABW) is a wing of the US Air Force stationed at Los Angeles Air Force Base, El Segundo, California. The 61st is the host unit at Los Angeles AFB, and commands all the Air Force support groups and units assigned to the base.
It is said that there is nowhere in our known universe that there is liquid water on or near the surface but Saturn's moon Enceladus has liquid water just beneath the surface and so does Jupiter's moon Europa.
At the mission briefing, pictures taken by the Hubble telescope of the "meteors" falling to Earth are shown to the marines. Hubble is a deep space telescope, virtually useless for taking pictures of anything in Earth's atmosphere.
SSgt. Michael Nantz: All right, Lockett. You wanna go there. Let's go there. I commanded men and men died. Kids. 19 years old. The best men I ever led. Do you think for a second I wouldn't rather trade places with them? I know you think I got my men killed. They're dead. I'm here. Like the punchline to some bad joke. You think I like that? Do you think a minute goes by that those faces aren't right here