The same panel where Tuvok accesses Sickbay's holomatrix in this episode also features in the previous one, Relativity (1999), as the location where the temporal disruptor was hidden.
Some of the footage of the planet, as seen from space, consists of stock optical shots that have been used in many past episodes of Star Trek: Voyager.
McKenzie Westmore (daughter of series makeup artist Michael Westmore) appears in this episode as Ensign Jenkins. This is her second appearance on a Star Trek show but her first as an adult. Eleven years earlier, when she was ten years old, she featured in The Next Generation episode "When the Bough Breaks" in an uncredited role. She played "Rose" one of the children abducted by a sterile but technologically advanced race.
In the opening scene Neelix says to Paris, "Fool me once, shame on you. Fool me twice, shame on me." This line was previously spoken by Scotty in Friday's Child (1967).