When the couple who believe themselves to be from another planet talk to one another, Loretta (played by Simona Williams, who was born in Denmark) speaks to Joe in Danish.
Look for a quick flash of the date of the John F. Kennedy assassination on one of the underground storage tanks.
Listen for a quote from a song by The Doors immediately following a visual reference to Jim Morrison.
While exploring the secret military base Marci finds an alien baby in a jar which originally came from John Carpenter's 1995 remake, Village of the Damned.