Phlox's line "I'm a physician, not an engineer" is an obvious reference to The Original Series, in which Dr. McCoy often complained that he was a doctor and not something else (ex: "I'm a doctor, not a mechanic."). T'Pol saying "Fascinating" is also a nod to TOS given that Mr. Spock often said the word.

This episode has a great deal of similarity to the fourth season Voyager episode, "One".

John Billingsley apparently does a nude scene. According to a UPN source talking to Sci Fi Wire, this was partly the result of production calling Billingsley's bluff.

When Phlox sees something on the hull of the ship, it is very similiar to Shatner's classic episode of The Twilight Zone, where he sees a creature on an airplane's wing during a flight.