This episode contains the second reference to the Dominion. The first reference was in Star Trek: Deep Space Nine: Rules of Acquisition (1993). The unidentified Dominion-member race which Haneek mentioned as having conquered the T-Rogorans were presumably the Jem'Hadar.
The trivia items below may give away important plot points.
Michael Piller decided to plot a down-beat ending to this episode and invert the happy ending of Frederick Rappaport's original teleplay. Piller felt the episode would carry more resonance if things didn't turn out okay for everyone.