This is the first reference to the Cardassian name for the station Deep Space 9: "Terok Nor".
This is the first time since the pilot that Gul Dukat has visited DS9.
Garak the Cardassian tailor (Andrew Robinson) is seen for the first time since his initial appearance in Past Prologue (1993).
This is the first time hostility between Garak and Gul Dukat is hinted at.
The novel The Never-Ending Sacrifice depicts Rugal's life after "Cardassians". It begins just after the episode ends and continues for eight years.