At approximately 8 minutes in, the console the second man from the left is sitting at is the same console used as the O.B.I.T. machine used in The Outer Limits "O.B.I.T.". For The Outer Limits a large "mixing bowl" shaped viewing screen was added.
The NORAD featured in this episode is an actual military command. The North American Air Defense Command was recommended by the Joint Canadian--U.S. Military Group in late 1956. The North American Air Defense Command was approved by the U.S. Joint Chiefs of Staff in February 1957. On October30, 1964 NORAD began manning the Combat Operations Center in the Cheyenne Mountain Complex outside of Colorado Springs, Colorado.
The NORAD command center located under Cheyenne Mountain, Colorado is a setting of Stargate SG-1.
Tunnel entrance to NORAD same tunnel used in Back to the Future 2. In Griffith Park in Los Angeles.