- Dawson Casting: Averted in the case of Michael Welch, who at 16 played the 15-year-old Luke. Played straight with Becky Wahlstrom, who at 28 years old played Luke's eight months older girlfriend.
- Dueling Shows: Was released at the same time as Wonderfalls, which had a very similar premise. But Fox didn't even try to put up a fight before cancelling in defeat.
- Executive Meddling: The show's second season suffered from massive amounts to make it more marketable to teens. Among the bigger issues were that Joan's missions from God were no longer about making the world around her a better place, but simply to learn a lesson about herself (derided by fans as "God is Joan's life coach"), the casting of both Duff sisters (albeit in separate episodes - Hilary in one, Haylie in three), and Adam cheating on Joan shortly after they finally started dating to introduce cheap teen melodrama at the expense of one of the most popular characters. Unfortunately, all this did was anger the fans the show already had, and it didn't survive to a third season.
- The Other Darrin: Subverted with second season Sammy, who is best friends with first season Sammy and takes over the store while first season Sammy takes care of his mentally ill wife. Also averts the One Steve Limit.
- Real-Life Relative: "Dog Walker God" was played by Russ Tamblyn, Amber Tamblyn's father.
- Reality Subtext: Amber Tamblyn, the actress who plays Joan, is an agnostic.
- Real Song Theme Tune: "One of Us" by Joan Osborne.
- Stunt Casting: Both Haylie and Hilary Duff. Also Adam Wylie, for those who fondly remembered Picket Fences.
Trivia / Joan of Arcadia