Karl Urban introduces Cupid, his Hercules: The Legendary Journeys (1995) character, to Xena's show, though Cupid and Xena don't meet in this one. He had previously met Xena as Mael in Altared States (1996) and Julius Caesar in Destiny (1997).
Aphrodite apes Mae West's famous line from I'm No Angel (1933), "When I'm good, I'm very good. But when I'm bad, I'm better."
The title references "For Whom the Bell Tolls" by Ernest Hemingway. Published in 1940, the plot of the novel is completely unlike the plot of this episode. The expression originally comes from a line in John Donne's epic poem "Devotions upon Emergent Occasions," published in 1624.
At 11:43 this castle makes yet another appearance in Xena.
Joxer, when expecting to be executed, recites a variation of Nathan Hale's alleged line "I regret that I have only one life to lose for my country."