Creepy Child: During production, the showmakers decided an animatronic baby would be less trouble than a real one. And decided to hire, of all people, the creators of Chucky to make it. The results were predictably creepy. And a real baby was used in the end.
Cyanide Pill: Promazine, the pill that the cultists were going to use. It was developed by the Cardassian Obsidian Order for their agents in the event of capture. Not only does it kill, but it causes the body to crumble to dust not long after, leaving no evidence behind.
Driven to Suicide: Vedek Fala willingly swallows his promazine pill, even though it's been revealed that Dukat is a fraud.
Oh, Crap!: Dukat, when Kira knocks his fake suicide pill to the ground amid many real ones. It's one of the few times in the series where he comes close to genuinely losing his cool.
One-Liner, Name... One-Liner: When Kira asks Vedek Fala why he swallowed the promazine pill that Dukat gave him, even though Dukat was a fraud:
Pet the Dog: Dukat contacts DS-9 to have them pick up Kira after his cult commits suicide.
Riddle for the Ages: An In-Universe one. Kira wonders what Fala meant when he said that faith was the reason he killed himself—did he have faith that he was doing what he was supposed to, or was it that his faith betrayed him?