The flashback of a young Gus (Eastwood) are taken from this film for close-ups of his face.
the Night Raven jet looks like the MiG-31 FIREFOX and also uses foreign-language commands instead of physical buttons to use the weapons
The opening cloud shots were originally used for the Clint Eastwood movie Firefox (1982).
A poster for the film can be seen in Williams' room.
Poster is shown in a video store.
"Are We Alone?" segment