Julie Costello and Shawnie Costello, who play the Swedish twin sisters Ilsa and Inga, bedmates for Jonathan, are from Kentucky, and according to Jane Espenson, their Swedish accents were dubbed in.
Brad Kane, who played Tucker Wells in The Prom (1999), provided the singing voice for Jonathan (played by Danny Strong).
The opening credits have been modified to center on Jonathan performing several heroic acts, such as defusing a bomb. The end of the sequence is a shot of Jonathan with a flowing cape, similar to the last shot of the opening sequence from Angel (1999), rather than the usual power shot of Buffy.
In the alternate reality, it's Jonathan and not Buffy who is the arch-nemesis of Spike. Spike demonstrates a different interest for Buffy, foreshadowing his future attraction toward the Slayer.
After playing the role of Jonathan on Buffy the Vampire Slayer (and playing other roles on several TV shows, including Gilmore Girls and Mad Men), Danny Strong made a career pivot to working behind the scenes as a writer and/or producer of such movies as Recount, Game Change, and Lee Daniels' The Butler and TV series including Empire. Brad Kane, who provided Jonathan's singing voice in this episode, also later became a writer of and producer for such shows as Fringe, Black Sails, Lodge 49, and Warrior.