This episode marks the introduction of T'Pol's new uniforms.

Scott Bakula and Stephen McHattie previously appeared in the final 'Quantum Leap' episode 'Mirror Image' together.

Rick Worthy and Stephen McHattie previously appeared in "The Magnificent Seven" episode, "Nemesis" together.

In the original airing of the episode, the series title in the opening credits was "Enterprise". When it was rerun on October 22, it was changed to "Star Trek: Enterprise".

Daniel Dae Kim (Corporal Chang), was the "Pilot" in the Voyager episode "Blink of an Eye".