- Casting Gag: Sir Ian McKellen, one of the greatest theater and film actors today, playing a faded actor whose career peak was a minor character on Doctor Who. Both Jacobi and McKellen have had single-episode guest parts on Doctor Who.
- Dawson Casting: In episode five, Chloe says that Ash is 22. Iwan Rheon was 28 at the time.
Freddie: I thought he was 35.
- I Take Offense to That Last One: When Sir Ian McKellen first received the script for the pilot, it was originally titled Vicious Old Queens. His response? "I'm not old!"
- Playing Against Type: Iwan Rheon's most famous role is the calculating and downright evil Ramsay Bolton of Game of Thrones, making the sweet, cheerful, and slightly naive Ash a towering contrast. When asked about it, he said it's refreshing to play someone nice for a change. Coincidentally, the series finale aired in America shortly before Ramsay's death aired, a fact not lost on him.