- Billing Displacement: Despite only appearing in one scene at the end, Jenna Coleman receives star billing as Clara anyway.
- Completely Different Title: The hungarian title of this episode is Tiszavirág (May-Fly).
- Deleted Scene: It turns out the Doctor did indeed drop in on Me during the Bubonic Plague- only he was too late, and disguised as a Plague Doctor (rather fittingly), too ashamed to show his real face to Me.Me: I'm moving on, there's nothing left for me here... You wanna know what's causing it? My money's on the rat fleas. Better sanitation is the answer.
- Meaningful Release Date: Ashildr mentions that she fought at the Battle of Agincourt. The episode was first broadcast the day before St Crispin's Day October 25, 2015, the 600th anniversary of the battle.
- Promoted Fanboy: Comedian Rufus Hound (Sam Swift) is a big Doctor Who fan, revealing in an appearance on panel show Argumental in 2009 that he has a Dalek tattooed on his left arm. Ironically, according to a behind-the-scenes featurette, Hound had to have make-up applied to cover up this and other tattoos in order to look period-accurate.
- Trailers Always Spoil: The blurb of a Series 9 tie-in novel posted online several weeks before the episode's broadcast revealed the nature of Maisie Williams' character and part of the plot of "The Girl Who Died".
- You Look Familiar: Karen Seacombe (one of the crowd) previously played Sandra.
Trivia / Doctor Who S35 E6 "The Woman Who Lived"