The Outer Limits

Patient Zero is the name given to the first known carrier of a disease.

Geographical Error: Colonel Devine says to his men that if they win the battle of Gettysburg they will "march through the Shenandoah Valley to the steps of the Capitol". That would be impossible, since the Shenandoah Valley lies to the south-west of Gettysburg and would take them away from Washington. Actually, the historical battle of Gettysburg was preceded by the passing through the Shenandoah Valley in May 1863, almost two months before Gettysburg.

Ron Perlman cut his eye while filming one of the fight scenes. Chris Mulkey, playing Mike, threw him across the room and he hit a camera.

Goof: The army men claim that when Josh healed the girl, an EMP that came from him knocked down two satellites. Then how was the camera that filmed him still functioning?

This episode originally aired at 12:20 AM, which was considered to have run May 15th by some TV listings.

When John starts putting out the fire, the entire fire goes out, even flames he didn't spray.

Goof: The cast credits mistakenly spells Casper Van Dien's first name as "Caspar".

When Trevor returns the second Time, the Song at the Bar is "White Rabbit" by Jefferson Airplane, a Song famous for the Anti-War Movement against the Vietnam War.

When Stan and Leslie are waiting for their hot fudge sundaes, the waitress brings them two glasses of water. Their conversation continues and when we next see the glasses, their positions have changed and the levels of water in them are different, although neither of them is seen touching the glasses.

Robert Ito, who plays Colonel Raymond, is wearing the rank of a senior airman of the U.S. Air Force on his jacket sleeves. On that jacket, officers would wear their insignia on the epaulets.

Plot Hole: If the message was in plain english all along, that means the aliens were able to understand english. In this case why did they not heed the president's warning and violated his request? It doesn't make sense. If they were friendly, they could have waited in Earth's orbit until they received the permission to enter.

Goof: When Givens travels back to kill Horowitz, she sets the computer to 12:00, February 18, 1980. When she arrives in the park, the date displayed in the subtitle is February 16, 1980

"I, Robot" was also the name of a 2004 movie which dealt with a robot killing his creator. It was based on a collection of short stories written by Isaac Asimov in the 1940s and published in book form in 1950.

Early in the episode, there is a live exchange between the astronauts and Megan Halliwell at ground control. However, there should have been a couple second of delay between question and response, the time it takes for the radio signal to reach a spacecraft three days' travel from Earth.

The beautiful music was from Rhapsody On A Theme Of Paganini, variation 18, by Sergei Rachmaninoff. The same music was featured in Somewhere In Time starring Christopher Reeve and Jane Seymour. Rhapsody On A Theme Of Paganini V18 has also been used in several other movies.

The footage of the test monkey in the cage that appears during the opening credits was also seen in the movie The Andromeda Strain.

One scene of this episode featured over 200 live scorpions.

The footage of the elevator going down to Simon's lab, and the elevator display saying "Sub Level 10, 11...etc." is the same footage used in the series premiere of Stargate: SG-1, of which now in it's 9th Season, Beau Bridges (Simon) is a regular.