- Acting for Two: Paul McGann also played the War Doctor in the scene where he takes Cass' bandolier after the regeneration.
- Meaningful Release Date: 14 November is Paul McGann's birthday. Though not intended, it was going to released exactly one week before the anniversary, but someone threatened to leak details.
- You Look Familiar: Emma Campbell-Jones previously played Dr. Kent in "The Wedding of River Song".
Trivia / Doctor Who 50th Prequel "The Night of the Doctor"