- What Could Have Been: Eris was supposed to return, but her actress was unavailable. The showrunners also decided that having to run it by one character every time the Defiant wanted to use the cloaking device was too much trouble. (It was originally meant to be used sparingly, but they wound up leaning on it heavily.)
- Xanatos Gambit: Invoked by the creative staff. Traditionally, Trek villain races are introduced one at a time, and if audience response is poor, they're simply never seen again. For the Dominion, it was decided to have it be represented by three species and introduced in the same three-parter, in order to test viewer reaction. Fortunately, the audiences reacted very well to the Founders, the Vorta, and the Jem'Hadar.
- You Look Familiar: Salome Jens (the female Founder) previously appeared as the unidentified alien woman whose people gave rise to all other intelligent life in the Milky Way.
Trivia / Star Trek Deep Space Nine S 03 E 02 The Search Part II